Jani Lane was an on and off singer for Warrant since their start up back in the 80s. The band's most well recognized tune is Cherry Pie and it propelled them into fame. There still is no certain cause of death, but like most glam rock celebrities, Jani had his issues with alcohol and drugs so it would not surprise me if the LA coroners find some sort of killer cocktail of drugs and alcohol in his system.
It's a sad day, friends. A small piece of 80s rock has passed on. Later.