Tom Brady mourns the loss of Kobe Bryant

NBA player Kobe Bryant and his daughter Gianna have died in a California helicopter crash on Sunday.

The crash occurred around 10 a.m. local time amid foggy conditions in the hills of Calabasas. Authorities say nine people are believed to have died in the crash.

Bryant spent his entire 20-year career with the Los Angeles Lakers. He won five championships with the team. He was 41 years old.

Coaches and athletes are paying tribute to Bryant following the shocking news of his death.

NFL Quarterback Tom Brady tweeted: “We miss you already Kobe.”

Entrepreneur Mark Cuban tweeted: “We can never forget how precious life is. How those who are special to you and never let them forget how deeply you love them.”

Boston Celtics legend Bill Russell tweeted: “Jeannine & I are absolutely shocked to hear of the loss of one of my favorite people & one of the best basketball minds in the history of the game! Our hearts & prayers to Vanessa & his girls. @kobebryant you were my biggest fan, but I was yours #RIPMAMBA”

LA Clippers head coach Doc Rivers was emotional and tearful after receiving the news of Kobe Bryant's death. He said, "Sorry I don't have a lot to say. I have to go talk to a team before a game and tell them to play and I can't."