Three weeks after his passing overnight on his band’s tour bus, the office of the chief medical examiner in Washington, D.C., has released the cause of death for Hawthorne Heights guitarist Casey Calvert. According to the autopsy, Calvert died due to the "acute combined effects of opiate, citalopram and clonazepam intoxication." According to, the autopsy listed Calvert’s death as accidental, though it added that it was brought on due to "substance abuse." Both citalopram (also known by the brand name Celexa) and clonazepam (also known by the brand names Klonopin and Rivotril) are prescription drugs, the former an antidepressant and the latter used to treat seizure disorders and panic attacks.

Calvert’s bandmates have previously confirmed the band will go on without him, and that they will not seek a replacement.