Warrant lead singer Jani Lane died from alcohol poisoning, sources tell TMZ.
The L.A. Coroner's Office has finished its investigation and determined Lane suffered from "acute ethanol poisoning," the website reports.
Lane was found dead on August 11 in a Woodland Hills area Comfort Inn. Alcohol and prescription drugs were found in his motel room.
He was 47.
With his long blond hair and tight leather outfits, Lane embodied the excess of 1980s "hair metal" rock bands. He joined Warrant in 1984 and wrote such hits as "Heaven," "Down Boys" and "Cherry Pie.
Several fellow stars from that era paid their respects, including Twisted Sister frontman Dee Snider.
"Jani Lane's is yet another sad story of a boy who attained his dreams of greatness, only to be blindsided by the pressures, temptations and disappointments of those same dreams," Snider said. "We all watched over the years, as he soared, stumbled, fell, then got up again and again. Tragically, he will get up no more. [Rest in peace], Jani."
Lane had an on-and-off relationship with the band, leaving it in 1992 before returning and quitting again several times.
In recent years, he appeared in the reality TV show "Celebrity Fit Club" and made news for a drunken driving arrest.
Lane wrote "Heaven" when he was with Warrant, and it was one of the band's biggest hits.
"We never thought that when the song 'Heaven' was written we would be playing it someday in the memory of Jani's untimely death," guitarist Erik Turner said after learning of Lane's passing.
Lane is survived by two daughters from two previous marriages.