WASHINGTONLOS ANGELES CHICAGO — - Michael Jackson's doctor halted CPR on the dying pop star and delayed calling paramedics so he could collect drug vials at the scene, according to documents obtained by the Associated Press that shed new light on the singer's chaotic final moments. The explosive allegation that Dr. Conrad Murray might have tried to hide evidence is likely to be a focus as prosecutors move ahead with their involuntary-manslaughter case against him. The account was given to investigators by Alberto Alvarez, Jackson's logistics director, who was summoned to the stricken star's side as he was dying on June 25. His statement and those from two other Jackson employees also obtained by the AP paint a grisly scene in Jackson's bedroom. Alvarez told investigators that he rushed to Jackson's room and saw the star lying in his bed, an IV attached to his leg. Jackson's mouth was agape, his eyes were open and there was no sign of life. Murray worked frantically, at one point performing mouth-to-mouth resuscitation while Alvarez took over CPR.