A 64-year-old man found dead in a pool of blood in the back of an ambulette parked in the Bronx worked as a driver of the vehicle — and was beaten to death, police said Tuesday. Cops declared Peter Forrest’s death a homicide after learning he died from “trauma to the body,

Peter Forrest, 64, was known as P. Fluid when he sang in the original lineup of 24-7 Spyz, a South Bronx-based band that mixed metal, hardcore, punk and funk and opened for Jane’s Addiction on