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Mark Balelo, Storage Wars

TLC

Sadly, Mark Balelo did take his own life.

The Ventura County Coroner's Office confirms to E! News that the 40-year-old Storage Wars star died of carbon monoxide poisoning and his death has been ruled a suicide.

Balelo was found yesterday in his car, the motor running, in the garage of his auction house in Simi Valley, Calif.

"We are deeply saddened by this tragedy and our thoughts are with Mark's family," A&E said in a statement today to E! News.

Balelo had been arrested Saturday on suspicion of possessing a controlled substance—and it turns out that was not his first run-in with the law.

Per Radar, he previously pleaded guilty in 2009 to sale or transport of a controlled substance, resulting in him being sentenced to 60 days in jail and three years' probation.

—Reporting by Holly Passalaqua