Heath Ledger's closest Hollywood pals, including ex-partners Michelle Williams and Naomi Watts, have spoken out for the first time since his death in January (08). The pair joined forces with director Todd Haynes - who made Ledger's movie I'm Not There - actors Sean Penn, Philip Seymour Hoffman, his agent Steve Alexander, and pal Ellen DeGeneres, to talk to Interview magazine about their relationship with the star. Williams, the mother of his daughter Matilda, describes Ledger's energy and talent, saying, "He had an uncontrollable energy. He buzzed. He would jump out of bed. "For as long as I'd known him, he had bouts with insomnia. He just had too much energy. His mind was turning, turning, turning - always turning. "He had a talent for everything that he put his mind to. He didn't know limits. "I think that the interesting thing about Heath, which maybe people have only really fully discovered in his death, his how vulnerable he was. "You can pick up on it in his performances, but it's easy to overlook because he was so physical and beautiful and strong and masculine. But there was always that underlying sensitivity. That's who he was." Watts, who dated Ledger for two years, adds, "His acting was just so touching, so connected in truth. I think he was just getting started." Seymour Hoffman, who met Ledger when they were both nominated for the Best Actor Oscar in 2006, describes the actor's "childlike enthusiasm," adding, "His body was always in motion." And his agent Alexander paints the picture of a Ledger as a "rolling stone". Ledger suffered a fatal accidental overdose of prescription drugs in his New York apartment on 22 January 2008. He was 28.