Kris Kross' Chris Kelly, left, and Chris Smith reunited in February for a 20th anniversary concert for So So Def Records.
- NEW: A neighbor says he was a "low-key type of person"
- Rapper Da Brat stunned by Kelly's death
- Kris Kross topped the charts with "Jump" in 1992
- Chris Kelly died Wednesday at an Atlanta-area hospital
(CNN) -- Chris Kelly, one-half of the 1990s rap duo Kris Kross, died Wednesday at an Atlanta hospital after he was found unresponsive at his home. He was 34.
How Kelly died isn't known, and the Fulton County Medical Examiner's Office said an autopsy is planned for Thursday.
Kelly, together with Chris Smith, shot to stardom in 1992 with "Jump," which spent eight weeks on top of the Billboard Hot 100.
The duo opened for Michael Jackson that year on his Dangerous World Tour.
A look back at those we have lost in 2013.
Chris Kelly, one-half of the 1990s rap duo Kris Kross, died on May 1 at an Atlanta hospital after being found unresponsive at his home, the Fulton County medical examiner's office told CNN.
Kelly, right, and Chris Smith shot to stardom in 1992 with the hit "Jump."
George Jones, the country music legend whose graceful, evocative voice gave depth to some of the greatest songs in country music -- including "She Thinks I Still Care," "The Grand Tour" and "He Stopped Loving Her Today" -- died on April 26 at age 81, according to his public relations firm.
Actor Allan Arbus poses for a portrait with his daughter photographer Amy Arbus in 2007. Allan Arbus, who played psychiatrist Maj. Sidney Freedman in the M*A*S*H television series, died at age 95, his daughter's representative said April 23.
Folk singer Richie Havens, the opening act at the 1969 Woodstock music festival, died on April 22 of a heart attack, his publicist said. He was 72.
Australian rocker Chrissy Amphlett, the Divinyls lead singer whose group scored an international hit with the sexually charged "I Touch Myself" in the early 1990s, died on April 21 from breast cancer and multiple sclerosis, her husband said. She was 53.
Pat Summerall, the NFL football player turned legendary play-by-play announcer, was best known as a broadcaster who teamed up with former NFL coach John Madden. Summerall died April 16 at the age of 82.
Comedian Jonathan Winters died on April 11 at age 87. Known for his comic irreverence, he had a major influence on a generation of comedians. Here he appears on "The Jonathan Winters Show" in 1956.
Sir Robert Edwards, a "co-pioneer" of the in vitro fertilization technique and Nobel Prize winner, died April 10 in his sleep after a long illness, the University of Cambridge said. He was 87. He is pictured on July 25, 1978, holding the world's first "test-tube baby," Louise Joy Brown, alongside the midwife and Dr. Patrick Steptoe, who helped develop the fertility treatment.
Annette Funicello, one of the best-known members of the original 1950s "Mickey Mouse Club" and a star of 1960s "beach party" movies, died at age 70 on April 8. Pictured, Funicello performs with Jimmie Dodd on "The Mickey Mouse Club" in1957.
Former British Prime Minister Margaret Thatcher, a towering figure in postwar British and world politics and the only woman to become British prime minister, died at the age of 87 on Monday, April 8.
Designer Lilly Pulitzer, right, died on April 7 at age 81, according to her company's Facebook page. The Palm Beach socialite was known for making sleeveless dresses from bright floral prints that became known as the "Lilly" design.
Film critic Roger Ebert died on April 4, according to his employer, the Chicago Sun-Times. He was 70. Ebert had taken a leave of absence on April 2 after a hip fracture was revealed to be cancer.
Jane Nebel Henson, wife of the late Muppets creator Jim Henson and instrumental in the development of the world-famous puppets, died April 2 after a long battle with cancer. She was 78.
Shain Gandee, one of the stars of the MTV reality show "Buckwild," was found dead with two other people in Kanawha County, West Virginia, on April 1. He was 21.
Music producer and innovator Phil Ramone, right, with Paul Shaffer, left, and Billy Joel at the Song Writers Hall of Fame Awards in New York in 2001. Ramone died March 30 at the age of 72.
Writer/producer Don Payne, one of the creative minds behind "The Simpsons," died March 26 at his home in Los Angeles after losing a battle with bone cancer, reports say. He was 48.
Gordon Stoker, left, who as part of the vocal group the Jordanaires sang backup on hits by Elvis Presley, died March 27 at 88.
Deke Richards, center, died March 24 at age 68. Richards was a producer and songwriter who was part of the team responsible for Motown hits such as "I Want You Back" and "Maybe Tomorrow." He had been battling esophageal cancer.
Legendary publisher, promoter and weightlifter Joe Weider, who created the Mr. Olympia contest and brought California Gov. Arnold Schwarzenegger to the United States, died at age 93 on March 23.
Playboy magazine's 1962 "Playmate of the Year," Christa Speck Krofft, died March 22 of natural causes at the age of 70.
Rena Golden, who held top positions at CNN, died at age 51 after battling lymphoma for two years on March 21.
Harry Reems, the porn star best known for playing Dr. Young in the 1972 adult film classic "Deep Throat," died March 19, according to a spokeswoman at a Salt Lake City hospital. Reems, whose real name is Herbert Streicher, was 65.
Bobbie Smith, who as a member of the Spinners sang lead on such hits as "I'll Be Around" and "Could It Be I'm Falling in Love," died on March 16 at age 76. Pictured clockwise from left, Spinners band member Pervis Jackson, Billy Henderson, Jonathan Edwards, Bobbie Smith and Henry Fambrough, 1977.
Sweden's Princess Lilian, the Welsh-born model who lived with her lover Prince Bertil for 30 years before they were married, has died at the age of 97, the Swedish Royal Court said in a statement.
Alvin Lee, the speed-fingered British guitarist who lit up Woodstock with a monumental 11-minute version of his song "I'm Going Home," died on March 6, according to his website. He was 68.
Hugo Chavez, the polarizing president of Venezuela who cast himself as a "21st century socialist" and foe of the United States, died March 5, said Vice President Nicolas Maduro.
Bobby Rogers, one of the original members of Motown staple The Miracles, died on Sunday, March 3, at 73. From left: Bobby Rogers, Ronald White, Smokey Robinson and Pete Moore circa 1965.
Actress Bonnie Franklin, star of the TV show "One Day at a Time," died at the age of 69 on March 1 of complications from pancreatic cancer.
Actor Dale Robertson, who was popular for his western TV shows and movies, died at age 89 on Thursday, February 28.
Richard Street, former member of the Temptations, died at age 70 on February 27. Street, second from the left, poses for a portrait with fellow members of the Temptations circa 1973.
Van Cliburn, the legendary pianist honored with a New York ticker-tape parade for winning a major Moscow competition in 1958, died on February 27 after a battle with bone cancer, his publicist said. He was 78.
Former U.S. Surgeon General C. Everett Koop died on February 25. He was 96. Koop served as surgeon general from 1982 to 1989, under Presidents Ronald Reagan and George H.W. Bush.
Damon Harris, former member of the Motown group the Temptations, died at age 62 on February 18. Harris, center on the stool, poses for a portrait with fellow members of The Temptations circa 1974.
Lou Myers, a stage, film and TV actor who memorably portrayed Mr. Gaines on the comedy "A Different World," died on February 19 at the age of 75.
Los Angeles Laker owner Jerry Buss died February 18 at age 80. Buss, who had owned the Lakers since 1979, was credited with procuring the likes of Earvin "Magic" Johnson, James Worthy, Shaquille O'Neal and Kobe Bryant. The Lakers won 10 NBA championships and 16 Western Conference titles under Buss' ownership.
Country singer Mindy McCready was found dead on February 17 of a self-inflicted gunshot wound, authorities said. She was 37. During her career, McCready landed 14 songs and six albums on the Billboard country charts.
Ed Koch, the brash former New York mayor, died February 1 of congestive heart failure at 88, his spokesman said.
Patty Andrews, center, the last surviving member of the Andrews Sisters, died at her Northridge, California, home on January 30, her publicist Alan Eichler said. She was 94. Patty is seen in this 1948 photograph with her sisters Maxene, left, and Laverne.
Baseball Hall of Famer and St. Louis Cardinals great Stan Musial died on January 19, according to his former team. He was 92.
Baseball Hall of Fame manager Earl Sidney Weaver, who led the Baltimore Orioles to four pennants and a World Series title with a pugnacity toward umpires, died January 19 of an apparent heart attack at age 82, Major League Baseball said.
Pauline Phillips, better known to millions of newspaper readers as the original Dear Abby advice columnist, has died after a long battle with Alzheimer's Disease. She died January 16 in Minneapolis, Minnesota, at age 94.
Aaron Swartz, the Internet activist who co-wrote the initial specification for RSS, committed suicide, a relative told CNN on January 12. He was 26. Swartz also co-founded Demand Progress, a political action group that campaigns against Internet censorship.
Claude Nobs, the founder of the Montreux Jazz Festival, died aged 76 following a skiing accident.
Richard Ben Cramer, the Pulitzer Prize-winning writer whose 1992 book "What It Takes" remains one of the most detailed and passionate of all presidential campaign chronicles, died January 7, according to his longtime agent. He was 62.
Director and stuntman David R. Ellis died on January 7. He directed "Snakes on a Plane."
Tony Lip, who played mob figures in the hit cable show "The Sopranos" and several critically acclaimed movies, died January 4, a funeral home official said. Lip, whose real name was Frank Vallelonga, was 82.
Character actor Ned Wertimer, known to fans of "The Jeffersons" as the doorman Ralph Hart, died on January 2. He was 89.
Pop-country singer Patti Page died on January 1 in Encinitas, California. She was 85. Born Clara Ann Fowler, Page was the best-selling female artist of the 1950s and had 19 gold and 14 platinum singles.
Photos: People we lost in 2013
And their penchant for wearing their clothes backward was, at least for a time, widely emulated.
"I'm wearing my clothes to work backwards tomorrow," Michael Skolnik, editor in chief of the hip hop site Global Grind said, when he learned of the death.
Leslie Tookes, a CNN project coordinator, lived next door to Kelly. Like others, she too was saddened by his untimely death.
"We often heard him playing classical music and the piano," Tookes said. "He was a low-key type of person who was very talented and courteous, friendly and wonderful to our 5-year-old twins.
"Indeed, gone too soon."
His family also mentioned the notable wardrobe adjustment in a statement mourning Kelly's passing.
"To millions of fans worldwide, he was the trendsetting, backwards pants-wearing one-half of Kris Kross who loved making music. But to us, he was just Chris -- the kind, generous and fun-loving life of the party," Kelly's family said in a statement.
Discovered at a mall
Kelly and Smith were 13-year-olds when they were discovered in 1991 at an Atlanta mall by producer Jermaine Dupri.
Going by the stage name Mac Daddy (with Smith known as Daddy Mac), the pair followed up their smash "Jump" with the single "Warm It Up."
Together, the songs pushed their debut album, "Totally Krossed Out," to multiplatinum status.
Next came 1993's "Da Bomb."
But the album failed to find the following of the duo's debut, in large part because the boys had hit puberty and they were marketed with a tougher image.
Their career never again reached the heights of their debut, but they continued to make music.
In 1996, the duo released the album "Young, Rich and Dangerous."
The pair reunited for one night in February for a 20th anniversary party for Dupri's So So Def label.
Rapper Da Brat, who also performed that night, wrote about Kelly's death, "REST IN PEACE TO MY LIL BRO CHRIS KELLY OF KRIS KROSS. Dam wasn't we JUST at rehearsal and doin a So So Def20 show?"
CNN's Ed Payne, Chelsea Carter and Tresha Lindo contributed to this report.
