Jani Lane's cause of death

TMZ has released the official cause of death of ex-Warrant singer:

Officials have determined Warrant singer Jani Lane died from alcohol poisoning, law enforcement sources tell TMZ. We're told the L.A. Coroner's Office has finished its investigation -- and concluded Lane had suffered from  "acute ethanol poisoning"  when he died in an L.A. motel room on 8/11/11.
As TMZ previously reported, investigators found a half-empty bottle of vodka and prescription medication in the motel room where Lane died.