04/29/2010 05:12 am ET Updated May 25, 2011

Brittany Murphy's Missing Vicodin

Brittany Murphy obtained a prescription for 120 hydrocodone (Vicodin) pills 11 days before her death .... and the day she died there were only 11 pills left in the bottle ... TMZ has learned.

What's more we've learned the L.A. County Coroner's Office cannot locate the doctor who prescribed the pills and they are on the hunt to find him.

Read more on tmz.com