NEW YORK --A massage therapist who discovered a lifeless Heath Ledger in his Manhattan apartment made her first call to Mary-Kate Olsen, according to an in-depth timeline police released Wednesday of the moments surrounding the Australian-born actor's death. Police said Ledger probably died sometime between 1 p.m. and 2:45 p.m. on Tuesday of what authorities say may be an accidental drug overdose. Authorities found six different types of prescription drugs in Ledger's apartment, including pills to treat insomnia and anxiety, according to two law enforcement officials who spoke on condition of anonymity because the investigation is ongoing. Three of the drugs were prescribed in Europe. Ledger's housekeeper, Teresa Solomon, arrived at his apartment with her own key and let herself in. At 1 p.m., she went to his bedroom to change a light bulb, and saw Ledger sleeping and heard him snoring. She left the room without thinking anything was wrong. At 2:45 p.m., massage therapist Diana Wolozin showed up for her appointment with Ledger, who didn't answer when she knocked on his door. She then tried to call him on his cell phone, but again got no response. She went into the bedroom, set up her massage table and again tried to wake Ledger. Wolozin told police that Ledger was cold to the touch, but she just assumed he was unconscious. She proceeded to grab his cell phone and call Mary Kate Olsen, whose number is programmed into the phone. Wolozin knew that the "Full House" star and Ledger were friends, and she asked Olsen for advice on what she should do next. Olsen, who also lives in Manhattan but was in California at the time, responded by saying she would send over her private security guards to help deal with the situation. In the ensuing moments, Wolozin realized that Ledger might be dead, and called 911. The emergency operator provided Wolozin directions on how to do CPR, but it was too late. Paramedics arrived minutes later -- at about the same time as Olsen's security guards. Numerous messages left at telephone numbers listed to Wolozin and Solomon were not returned Wednesday.