White was found dead of an apparent suicide on September 28th, with various medications found at the scene.
"There were four prescriptions: Ambien, Percocet, Propranolol and Zofran … [they] were not [written] in her name," the coroner said.
The magazine's sources claim the medications belonged to Carrey and were prescribed under an alias. The insider also asserts that Carrey was unaware she had taken the pills from his home and says the Hollywood star has cooperated fully with authorities.
Jim, 53, and Cathriona met in 2012 and dated for a few months before splitting up. They were most recently spotted together, holding hands in New York this past May.