The 48-year-old comedian — who was found dead in Los Angeles on Feb. 22 — hanged himself, according to a death certificate obtained by TMZ.
The document stated that Stevens’ history of mental illness was a contributing factor. The star, who had been open about his struggles with mental health previously, suffered from depression and bipolar disorder, according to the certificate.
Stevens, who was born Steven James Brody, died at his Valley Village home last month just before 1 p.m., the certificate states.
Stevens appeared as Officer Foltz in the 2009 comedy The Hangover.