Friends and fans are concerned for the star following a string of incidents, including a recent hit-and-run that could result in jail time for Cassidy, and his stepmother and former The Partridge Family co-star Shirley Jones tells Closer Weekly she fears the worst.

"We are just scared to death that we are going to wake up one morning and find out that he is dead on the floor," the actress says.

Jones reveals David has turned his back on family and friends in recent years as reports of his alcohol problems escalated - and he now has no contact with her or his half-brothers, Shaun, Patrick and Ryan Cassidy.

"David has not had a relationship with anyone in the family for years," she tells Closer. "We are sick over it."

Since 2010, Cassidy has pleaded no contest twice and guilty once to three DUI arrests in three different states, and this week (begs12Oct15), he pleaded not guilty to leaving the scene of an accident and driving with a suspended license relating to an incident in Florida last month (Sep15).