The guitarist was found dead on band's tour bus outside of a Washington DC club on November 24th. The MTV report also said that "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." - more on this story