Dennis Hopper, the high-flying Hollywood wild man whose memorable and erratic career included an early turn in "Rebel Without a Cause," an improbable smash with "Easy Rider" and a classic character role in "Blue Velvet," has died at the age of 74.Hopper died Saturday at his home in the Los Angeles beach community of Venice, surrounded by family and friends, family friend Alex Hitz said. Hopper's manager announced in October 2009 that he had been diagnosed with prostate cancer.