EXCLUSIVE: Casey Johnson Autopsy Completed

RadarOnline.com has exclusively confirmed that the autopsy on Casey Johnson has been completed.

A senior source at the Los Angeles Coroner's office confirmed the news and said the cause of death has been deferred pending the results of the toxicology tests.

Johnson, who was found dead at her Los Angeles home on Monday, has had many ups and downs including drug abuse problems and alienation from her wealthy family. RadarOnline.com recently unearthed video of Johnson from October where she displays some erratic behavior such as revealing her friend's breasts, struggling to stand up straight, etc.