LONDON — British singer Joe Cocker is dead at age 70.His London-based agent, Barrie Marshall, said Cocker died early Monday of lung cancer in Colorado, where he has lived for the past two decades.Cocker was known for a memorable Woodstock performance and cover of the Beatles' "With a Little Help From My Friends."The ballad "You Are So Beautiful," with Cocker's voice cracking on the final emotional note, was a Top Ten hit in 1975.