Chris Kelly Tragic LAST VIDEO Drugged Out Rap Session

5/6/2013 5:00 AM PDT

Hours before his death, a drugged out Chris Kelly attempted to rap ... and spit out lyrics about a room full of dead bodies ... and TMZ has the sad footage. 

The video -- shot in Kelly's Atlanta home around 7:00 AM on May 1 -- is a window into the life of a drug addict. There's crap strewn all over the house ... and several seemingly drugged out people just hanging out.

One of Kelly's guests -- who also seems inebriated -- pulls out a camera and begins to record as a discombobulated Kelly struggles to rap along with music pumping through the speakers.

We're told the song is a track Kelly had been working on recently -- and includes the lyric, "We don’t stop, for nothing or nobody … look around you it's full of dead bodies."

0506_kelly_sub_2Hours after the video was shot, someone in Kelly's home called 911 and told officials the Kris Kross rapper passed out and wouldn't wake up. He was pronounced dead around 5:00 PM.

According to the police report obtained by TMZ, Kelly's mother told cops Kelly had been mixing cocaine and heroin the night before he died.

He was 34.