Friends, colleagues and fans mourned Kobe Bryant on Monday as federal investigators sifted through the wreckage of the helicopter crash that killed the basketball legend and eight other people, hoping to find clues to what caused the accident that stunned the world. Bryant, 41, was traveling Sunday with his 13-year-old daughter Gianna and seven other passengers and crew when the Sikorsky S-76 slammed into a rugged hillside in thick fog in Calabasas, northwest of LA. A five-time NBA champion for his only team, the LA Lakers, and a double Olympic gold medalist, Bryant was widely regarded as one of the greatest basketball players in history.