This happened to me in Rimworld Version 532 (Version 6)
Vibrating Dead Prisoner
So what happened was I had this prisoner that was dying of starvation ( I am not sure if thus was a bug as the prisoner wouldn't eat and had plenty of food) as starvation reached 100% the prisoner began vibrating and turned with the sound for punching being repeatedly heard in the vicinity. I have no idea what triggers it but I have had other prisoners die from this.
Vibrating Dead Prisoner
So what happened was I had this prisoner that was dying of starvation ( I am not sure if thus was a bug as the prisoner wouldn't eat and had plenty of food) as starvation reached 100% the prisoner began vibrating and turned with the sound for punching being repeatedly heard in the vicinity. I have no idea what triggers it but I have had other prisoners die from this.