John Michael lnocenio pleaded not contest to voluntary manslaughter, ending a case that has spanned four-and-a-half years, including a time Inocencio was thought to be mentally incompetent for trial.
Roger Rempfer, 41, was charged not only with molesting a 12-year-old girl allegedly he met on Snapchat, but also with possessing methamphetamine and heroin for sale.
Ronnie Martinez and Phe Phan were both allegedly associated with a gang known as the Livermore Valley Mexicans, and the victim was associated with a rival Blue Rag Soldiers gang, but police haven't publicly commented on the suspected motive.
Two people sustained stab wounds during the party on Elizabeth Court, which had more than 100 attendees, most of whom were belligerent and uncooperative, police said.