Determination of the cause of death was pending an autopsy and toxicology results, Clark County coroner's spokeswoman Samantha Charles said.
A neighbor summoned police and paramedics to the house, where he was pronounced dead, police and coroner's officials said.
There was no forced entry, and no suspicious circumstances were reported, police Officer Jose Montoya said Monday.
Quiet Riot was best known for its 1983 cover of "Cum on Feel the Noize." The song, featuring Dubrow's powerful, gravelly voice, appeared on the band's album "Metal Health" — which was the first by a metal band to reach No. 1 on the Billboard chart.
DuBrow recorded his first solo album in 2004, "In for the Kill," and the band's last studio CD, "Rehab," came out in October 2006.
YouTube video's courtesy of 80sMetalVideos.