Jonathan Phillips / REUTERS
Chris Kelly of Kris Kross performs in February 2013.
Kris Kross rapper Chris Kelly's death is being investigated as a possible drug overdose, Cpl. Kay Lester, a spokeswoman for Atlanta's Fulton County police, told NBCNews.com.
Information obtained from family members and others at the scene helped lead the investigation in that direction, but more information won't be known until toxicology results are back from Kelly's autopsy, Lester said.
That autopsy, completed Thursday morning in Atlanta, showed no signs of foul play or trauma, the Fulton County medical examiner's office told NBCNews.com. Toxicology results will be available in approximately three weeks, a spokeswoman said.
Kelly, 34, was discovered unresponsive in his Atlanta home Wednesday and pronounced dead early that evening. Kelly and childhood friend Chris Smith traveled the world as 1990s rap group Kris Kross when they were just 13, and their hit song "Jump" was certified double platinum.
On Thursday, both Chris Smith and Kelly's family issued statements mourning Kelly.
"His legacy will live on through his music, and we will forever love him," said the statement from Kelly's mother, Donna Kelly Pratte, and his record label So So Def.
In his statement, Kelly's musical partner Smith said, "Our friendship began as little boys in first grade. We grew up together. It was a blessing to achieve the success, travel the world and entertain Kris Kross fans all around the world with my best friend."