Governor Schwarzenegger's top prison adviser is leaving his job, to be replaced by the current inspector general of the state's prison system.

Jim Tilton has served as secretary of the California Department of Corrections and Rehabilitation since 2006 -- the third top prison official to serve under Schwarzenegger in the last five years.

This morning's announcement comes on the heels of yesterday's news by the court-appointed receiver for prison health care that another $7 billion is needed to bring the California prison medical system up to snuff.

Tilton will be replaced by Matthew Cate, who has been inspector general of the state's prisons since 2004 and was previously a deputy state attorney general.