All nine people on board the helicopter died, including Bryant's 13-year-old daughter, Gianna.
Investigators are expected to focus on the weather conditions, which were foggy, and on any mechanical failures that may have occurred.
Bryant was considered to be one of the greatest players in the game's history.
He was a five-time NBA champion for his only team, the Los Angeles Lakers, and a double Olympic gold medallist. He retired in April 2016.\