TMZ is reporting that Starr's body was found in a Salt Lake City home Tuesday; police say they were called to the house at 1:42 p.m. No foul play is suspected.
Starr was 44 years old.
Mike's dad tells TMZ.com, "It's a terrible shock and tragedy."
Starr was arrested last month for felony possession of a controlled substance. Salt Lake City police say he had 6 Xanax pills and 6 Opana (painkiller) pills when he was busted without a prescription for either.
At the time, Starr was a passenger in a car driven by Travis Meeks of Days Of The New, who was pulled over on a routine traffic stop; a police report indicated Mike tried to play the “do you know who I am?” card, telling police:
"[Mike] stated 'Hey officer, have you heard of Alice in Chains? I used to be the base [sic] guitarist for them. We are down here in Utah. Me and Travis are putting together a new band.'"
Starr split from Alice In Chains in 1993; he previously appeared on the third season of "Celebrity Rehab" back in 2009.
An autopsy is expected to provide answers to Starr’s passing.

Alice In Chains – Rooster (1992)
See also:
Alice In Chains issue statement on passing of Mike Starr