Chris Kelly has had a long struggle with drug abuse. For almost his entire career he has been in and out of rehab and tried to overcome his addictions. He had come a long way and was sober more often than he was using and had been clean for a fairly long stretch before there was a Kriss Kross reunion concert. With that concert came a lot of money being tossed around and a lot of free drugs and the next thing you know, Chris Kelly was back to his old ways. His mom said that she had been trying to help and trying to keep a close eye on Chris and that she saw him the night he overdosed and thought he would be ok judging from her past experience. He wasn't and he died. She is probably feeling overwhelming guilt. She shouldn't. She tried.