Murphy's mum Sharon is said to have called emergency services on Sunday night (23May10) after finding the screenwriter unconscious in the master bedroom of the Hollywood Hills property where the Clueless star died in December (09). He is believed to have suffered a cardiac arrest.
Resuscitation efforts failed and he was pronounced dead at the scene, according to ETOnline.com.
Sergeant Louie Lozano of the Los Angeles Police Department (LAPD) tells the website, "We have detectives at (the) scene. They are conducting their investigation."
The L.A. coroner ruled in February (10) that Murphy died after from pneumonia, complicated by anaemia and multiple drug intoxication.
She is said to have gone into cardiac arrest at the house she shared with Monjack and Sharon, and was pronounced dead at Cedars-Sinai Medical Center in Los Angeles on 20 December (10).