Heath Ledger's Brokeback Mountain co-star is taking his death harder than anybody else. A source tells People magazine that Gyllenhaal, who had lip locked with the actor during a scene in the controversial movie, has been traumatized from his friend's death, as the two were very close.

"Jake is taking this harder than most people," the source says.

Mary-Kate Olsen is set to be questioned by police about Heath Ledger's death. The 'Weeds' star - who was romantically linked to the 'Brokeback Mountain' star following his split from Michelle Williams last September - was contacted by Ledger's masseuse Diana Wolozin when she found the actor's body in his New York apartment. Olsen then sent her security staff to the apartment.

It has now been revealed that Wolozin called Olsen four times before calling emergency services, not twice as was originally reported. The additional calls were discovered when police examined phone records, according to National Enquirer magazine.

Heath Ledger's masseuse called Mary-Kate Olsen twice on discovering his body before contacting emergency services. Police sources have confirmed Diana Wolozin used the speed dial on Ledger's mobile phone to call Olsen in California after finding the 'Brokeback Mountain' star unconscious at his New York apartment at 2.45pm on Tuesday.

A source told America's People magazine: "Wolozin arrived at the apartment and when Ledger did not come out of his bedroom she called his cell and got no answer. She went into the room and found him lying on the bed. She shook him but he did not respond. So she used his speed dial to call Olsen."

Heath Ledger's initial autopsy results are inconclusive. The 28-year-old Australian actor was found dead in his New York apartment on Tuesday afternoon with sleeping pills scattered around his naked body, but the New York City Medical Examiner's Office have been unable to confirm whether his death was drug related.

Ellen Borakove, a spokeswoman for the office, said: "It will take about 10 days to complete the investigation."

Heath Ledger has died. The 28-year-old Academy Award-nominated actor has been found dead in his New York residence in Soho.

According to NYPD, Ledger's housekeeper and a masseuse found the actor unconscious on his bed around 3:30pm ET. When he did not respond after they tried to wake him up, they had immediately called 911. The police said no foul play was likely involved. They had found pills near the body.