The mother of 32-year-old West Marin resident Adam Emmott, who died last year from a prescription drug overdose, has added the Coastal Health Alliance and its executive director, Steven Siegel, to the list of defendants in a wrongful death lawsuit. 

Kris Teplin filed the suit in Marin Superior Court against her son’s physician, Dr. Wendi Joiner, on Dec. 31. According to attorneys, the case is now expected to move to federal court, since the health…