STORY HIGHLIGHTS

Los Angeles (CNN) -- Whitney Houston drowned face down in a tub of "extremely hot water" about 12 inches deep, the final autopsy report on the singer's death said.

The Los Angeles County coroner ruled that Houston's February 11 death was an accidental drowning with the "effects of atherosclerotic heart disease and cocaine use" as contributing factors.

The coroner's report stopped short of detailing what happened to Houston, but HLN's Dr. Drew Pinsky, an addiction medicine specialist, examined the autopsy report for CNN and suggested she might have suffered a seizure brought on by the use of cocaine possibly combined with a withdrawal from alcohol and a prescription sedative.

An empty bottle of the Xanax was found in her room, but the level of the sedative found in her blood was low, he said. Empty beer bottles were also found, but alcohol was not detected in her body, he said.

Report: Houston found face down in tub

Dr. Drew on Whitney's coroner report

Whitney's public struggle with addiction