(AP Photo | Mark J. Terrill) In this Jan. 26, 2020 photo firefighters work the scene of a helicopter crash where former NBA star Kobe Bryant died, in Calabasas, Calif. Federal investigators say wreckage from the helicopter that crashed last month and killed Bryant, his daughter and seven others did not show any outward evidence of engine failure, the National Transportation Safety Board said Friday, Feb. 7, 2020.