Chris Williams, front man/co-founder of Backbone69 and son of songwriter Jerry Lynn Williams, died Sunday after a van he was driving veered off a Malibu cliff and plunged 600 feet. He was 31.Backbone69, formed in the early 1990s, comprised the sons of rock music legends: Williams on vocals and guitar; Alex Orbison, son of Roy Orbison, on drums; Duane Betts, son of the Allman Brothers’ Dickey Betts, on guitar; and Berry Oakley, Jr., son of the Allman Brothers’ Berry Oakley, on bass. Locals said it was influential in the creative enclave of Malibu and was near to a big break in the rock recording field. William’s father has written for such stars as Eric Clapton, Bonnie Raitt and Stevie Ray Vaughn. In addition to his father, Williams was survived by his long time girlfriend, Roxy Starr.