Los Angeles Lakers legend Kobe Bryant has died in a helicopter crash, according to reports.
The two-time Olympic gold medallist was 41.
ESPN's Adrian Wojnarowski reported that Bryant's 13-year-old daughter Gianna, one of his four daughters, also was killed in the crash.
Early reports said five people were on board but LA County Sheriff Alex Villanueva later confirmed on Sunday that nine people came down with the helicopter.
There were no survivors.
The Associated Press reported that the crash happened around 10 a.m. local time about 30 miles northwest of downtown Los Angeles.
Federal Aviation Administration spokesman Allen Kenitzer said it was a Sikorsky S-76 and it was not known what caused the crash.
Reaction from the sports world and beyond has seen an outpouring of tributes online.
Michael Jordan "in shock"
When LeBron heard
11-time NBA champ Bill Russell couldn't believe the news either, calling Kobe "one of the best basketball minds in the history of the game."
"He meant so much to NBA fans"
Frazier and Breen talk up Bryant's impact on his sport and the simple reason why hundreds of millions around the world were transfixed watching him play:
"He loved playing basketball."
Knicks hold moment of silence
NBA stands still for eternal No. 24
"A true legend" - Cristiano Ronaldo
Juventus and Portugal star Cristiano Ronaldo was another footballer who knew Bryant.
"Can't believe my hero and friend is gone" - Ice Cube
TMZ is reporting that one of his daughters was also aboard his private helicopter.
Football Olympic gold medallist Neymar has posted his tribute to Kobe.
Swimming G.O.A.T. Michael Phelps had a lot in common with Kobe, he has posted these photos of himself with Kobe on Instagram:
NBA game stops mid-match for tribute
Six-time NBA All-Star and Olympian Pau Gasol expresses what we all feel right now.
The National Basketball Players Association have released this statement:
"We are stunned and devastated by the news of the sudden passing of Kobe Bryant. Words cannot express his impact on our players, the NBA and the game of basketball. This is a monumental loss for the entire basketball community and our hearts are quite simply broken. We send love and prayers out to his wife Vanessa and the entire family."
Another Laker and 6-time NBA champ wants to remember Kobe for the man he was.
"An unthinkable day" - Barack Obama
FIBA pay respects
Shaq played with Kobe at the Los Angeles Lakers from 1996 to 2004, they won three consecutive NBA Championships 2000, 2001, 2002.
"Please tell me it's a lie... Kobe"
"My heart is in pieces" - Taylor Swift
Bryant's impact went way beyond basketball and the world of sport, some of the biggest artists around have been posting for Kobe including Taylor Swift and Pink.
From NBA Commissioner Adam Silver:
"The NBA family is devastated by the tragic passing of Kobe Bryant and his daughter, Gianna."
"For 20 seasons, Kobe showed us what is possible when remarkable talent blends with an absolute devotion to winning. He was one of the most extraordinary players in the history of our game with accomplishments that are legendary: Five NBA championships, an NBA MVP award, 18 NBA All-Star selections, and two Olympic gold medals. But he will be remembered most for inspiring people around the world to pick up a basketball and compete to the very best of their ability. He was generous with the wisdom he acquired and saw it as his mission to share it with future generations of players, taking special delight in passing down his love of the game to Gianna.
“We send our heartfelt condolences to his wife, Vanessa, and their family, the Lakers organization and the entire sports world."
Notes to Kobe
People are putting hand-written notes on the wall next to his mural on Melrose in LA.
"We love you brother" - Kanye
Remember the Nike ad these two did back in 2012?
Another Lakers legend, Magic played guard for 13 seasons in Los Angeles, and won Olympic gold at Barcelona 1992.
LA County press brief:
Doc Rivers in tears
Kobe relationship with death a "comfortable one"
This interview revealed how Kobe felt about death, which he saw as a natural and essential part of life.
Magic has been tweeting about Kobe's famed work off the court.
The expert's view
"You will be forever missed" - AC Milan
Bryant's love of Italy and football (soccer) was well known, the Italian giants have paid their tributes too.
Tyson Chandler in tears
Fellow 2012 Olympic champ Tyson Chandler was on the bench when he heard the news.
"The fire" - Tiger Woods remembers Kobe
Tiger Woods was told the news of Bryant's death after his final round at the Farmers Insurance Open in California.
"[Caddie] Joey [La Cava] told me coming off 18th green," said Woods, "I didn’t understand why the crowd was saying “beautiful Mamba” now I know.
"It’s unbelievably sad and the reality is sinking in because I was told about five minutes ago.
"He brought a desire to win every night on both ends of the floor, not too many guys can say that. Any time he was in the game he’d take on their best player."
"Everybody is a Laker today" - Paula Abdul
Gianna Bryant's basketball team
Here's an interview he did next to Gianna at a UConn game, talking knowledgeably about the women's game and why his daughter chose to support UcConn.
The great No.8
"A real champion" - USA Basketball
"Legends are forever" - Paul Pogba
"Bigger than basketball"
The NBA came to a standstill out of respect for Kobe tonight.
They were on their feet in the Madison Square Garden.
"One of the most inspiring athletes" - Nathan Chen
Transcending borders, boundaries, sports and disciplines, Kobe Bryant's drive and determination had a lesson for everyone in all walks of life.
Double world champion figure skater Nathan Chen reflected on his legacy and how Kobe inspired him.
So many stories, so many moments, so many memories.
Gabby Douglas was gymnastics gold medallist at London 2012 for Team USA - the same Olympics where Kobe won the second of his two gold medals.
Star Wars' Kobe Bryant tribute
"Thank you for being such an inspiration" - Nastia Liukin
U.S. Olympic gymnastics champion Nastia Liukin tried to put it into words.
Thousands gather at Staples Center
Reports are coming in that thousands of people are gathering at the Staples Center where the Lakers play to pay their respects.
The Rock: "Love is forever"
Dallas Cowboys express deepest sympathies
An inspiration in life and in death
Kobe lives on through his words, deeds and achievements.
Great baller, even better father
BTS mourn Kobe at Grammy's: "We are so sad and were big fans"
BTS fans are apparently trying to coordinate so that they don't out-trend Kobe's passing on Twitter.
Alicia Keys: "We love you Kobe"
It's a big night for some of the biggest artists on the planet at the Grammy's, Alicia Keys remembered Kobe Bryant on stage.
The Grammy's are bing held at the Staples Center where the Lakers play, and where Kobe shone brightest.