The cause of death for Adam Harrison, the son of Pawn Stars creator and host Rick Harrison, has finally been released more than a month after his death. The 39-year-old Harrison died of a lethal mix of fentanyl and methamphetamine after a drug overdose, USA Today reported on Thursday. The Clark County coroner ruled his death an accident and plans to release a full report at a later date. Harrison, who was a plumber, was found dead in his Las Vegas home on Jan. 19 after a neighbor and landlord expressed concerns about him to the police. In a statement to TMZ made three days later, Harrison’s father Rick said simply, “The fentanyl crisis in this country must be taken more seriously.” The synthetic opioid is a primary driver of overdose-related deaths in the country, and according to a recent study by the Millennium Health laboratory, its lethal use alongside substances like methamphetamine is becoming more and more common.