Robin Williams’ three children have spoken of the “immeasurable loss” of their “father and best friend” and their struggle to come to terms with his suicide.
The 63-year-old actor was found dead on Monday after hanging himself at his home in Tiburon, California.
His daughter, Zelda Williams, talked of the last day they spent together on his recent birthday, when she and her brothers shared “gifts and laughter”.
“He was always warm, even in his darkest moments,” the 25-year-old said.
“While I'll never, ever understand how he could be loved so deeply and not find it in his heart to stay, there's minor comfort in knowing our grief and loss, in some small way, is shared with millions.”
Barack Obama, Prince Charles, Steven Spielberg and countless actors who worked with Williams in his decades-long career were among those who shared their memories of the comedian in an unprecedented outpouring of tributes.
After achieving fame as eccentric alien Mork in the popular late-70s sitcom, Mork and Mindy, he went on to appear in loved and acclaimed films including Good Morning, Vietnam, Mrs Doubtfire and Good Will Hunting, for which he won an Oscar.
Williams made no secret of his long battle against cocaine and alcohol addition, once joking that cocaine was “God's way of telling you you're making too much money” and had recently started a rehabilitation programme after months of non-stop work.
Robin Williams: A career in pictures
Robin Williams: A career in pictures
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1980: Robin Williams in the world-famous Mork and Mindy series that launched his career.
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1984: Williams in 'Moscow On The Hudson'. The actor earned his first Golden Globe nomination for his turn as a Russian circus performer in this 1984 hit.
3/30 Robin Williams
1987: Williams in the critically acclaimed 'Good Morning, Vietnam'. Williams ad-libbed all the radio broadcast scenes from this 1987 film about a radio DJ sent to Vietnam to entertain the US troops serving out there.
4/30 Robin Williams
1989: Robin Williams appeared with Robert Sean Leonard and Josh Charles in 'Dead Poets Society' as English teacher John Keating - or the “slightly more daring O Captain, My Captain”.
5/30 Robin Williams
1990: Williams and Robert De Niro in Awakenings, an emotional film that saw Williams portray a British neurologist who administered a drug to catatonic patients that briefly awoke them from decades of catatonia.
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1991: Williams appeared as an adult Peter Pan forced to return to Neverland to rescue his children in 'Hook'. The film received mixed reviews but proved popular at the box office.
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1992: Williams in 'Toys'. The film followed a military general after he inherits a toy factory and decides to produce war toys.
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1993: Williams appeared in one of his best-loved roles in Mrs Doubtfire, where he played an actor disguising himself as a female housekeeper in order to spend more time with his children.
9/30 Robin Williams
1995: Williams appeared as man released from a board game after being trapped for decades inside it in the blockbuster 'Jumanji'.
10/30 Robin Williams
1996: Williams starred opposite Jennifer Lopez in 'Jack', a film about a young boy who ages four times faster than other children.
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1997: Williams appeared alongside Matt Damon in 'Good Will Hunting', a film that won him an Oscar for his portrayal of psychologist Sean Maguire. As he accepted his award, a touched Williams warned the audience: "Oh man, this might be the one time I’m speechless".
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1997: The box-office hit Flubber saw Williams take the role of Professor Philip Brainard, who creates the unstoppable green goo Flubber in his bid to produce a new energy source.
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1998: Williams gave a poignant turn as Dr Hunter 'Patch' Adams, an unqualified doctor who treats patients with laughter in 'Patch Adams' .
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1998: Williams stars alongside Cuba Gooding, Jr in 'What Dreams May Come', a film that follows American physician Chris Nielsen's journey through the afterlife after he is killed in a car crash.
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1999: Robin Williams, Bob Balaban (left), and Armin Mueller-Stahl star in the movie 'Jakob the Liar' about a Jewish shopkeeper who uses his imagination to engender hope throughout a Polish ghetto in 1944.
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1999: American Science Fiction drama 'Bicentennial Man' followed an android (Williams) as he experiences emotions and becomes more human
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2002: Williams took a more sinister role as reclusive crime writer and murderer Walter Finch in 'Insomnia'.
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2002: Williams undertook an unsettling, psychopathic role in One Hour Photo, where he played a photo lab technician obsessed with a family who frequented the store.
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2002: Williams starred alongside Danny DeVito in 'Death to Smoochy', a film about a corrupt children's television host disgraced by an FBI sting.
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2005: Robin Williams stars in 'The Big White', a film about a financially struggling travel agent trying to make a bogus life insurance claim in order to pay for his wife's Tourette treatment.
21/30 Robin Williams
2006: Williams and Ben Stiller star in 'Night at the Museum'. Williams will appear in upcoming film "Night at the Museum: Secret of the Tomb," playing the statue of Teddy Roosevelt who comes to life at night.
22/30 Robin Williams
2006: Robin Williams, Jeff Daniels and Cheryl Hines star in roadtrip comedy 'R.V.', which followed the tribulations of a dysfunctional family.
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2006: Williams took the leading role in the political comedy drama 'Man of the Year' about a comedian who decides to run for President and finds himself mistakenly elected.
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2007: Robin Williams and Freddie Highmore in 'August Rush', where Williams played a homeless musician who teaches children living on the streets music and employs them as performers.
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2007: Robin Williams, Mandy Moore and John Krasinski starred in 'License to Wed'. Williams played a reverend who places a couple through a series of tests to see if they should marry in his church. The rom-com was poorly received by critics.
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2010: Robin Williams and John Travolta star in 'Old Dogs', a comedy that sees two friends and owners of a sports marketing firm struggle to deal with seven-year-old twins placed in their care. The film was nominated for four Golden Raspberry Awards.
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2013: Susan Sarandon, Robert De Niro and Robin Williams star in The Big Wedding
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2013: Williams starred as President Eisenhower in Lee Daniels' 'The Butler'.
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2014: Robin Williams with his Mork and Mindy co-star Pam Dawber in The Crazy Ones series. It was axed after one season.
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2014: Rob Williams stars in 'The Angriest Man in Brooklyn', the story of a bad-tempered man mistakenly told he has 90 minutes to live.
His publicist confirmed after he had been suffering from severe depression in recent weeks.
His son, Zak Williams, said he will carry his father’s heart with him every day.
“I would ask those that loved him to remember him by being as gentle, kind, and generous as he would be,” he added.
Video: The death of Robin Williams“Seek to bring joy to the world as he sought."
Cody Williams, the actor’s youngest child, said there were “no words strong enough to describe” his love and respect for his father.
He added: “The world will never be the same without him.
“I will miss him and take him with me everywhere I go for the rest of my life, and will look forward, forever, to the moment when I get to see him again.”
Williams was last seen alive by his wife, Susan Schneider, on Sunday evening and she left the house on Monday morning to run errands believing he was asleep.
When Williams didn't answer a knock on the door a short time later, his personal assistant found him dead in a bedroom.
Officials said all evidence indicates the actor committed suicide by hanging himself but a final ruling will be announced after toxicology reports and interviews with witnesses are complete.
A pocket knife was found close to the actor’s body, and there were superficial injuries on the body that were likely self-inflicted.
Family friends said Williams had been concerned about his finances in recent months and taken on a relentless work schedule, including the axed television show The Crazy Ones and a soon to be released Night at the Museum sequel.
His ex-wife Marsha Garces Williams, who is Zelda and Cody's mother, said her “heart was split wide open”.
“My arms are wrapped around our children as we attempt to grapple with celebrating the man we love, while dealing with this immeasurable loss,” she added.
Her daughter said: “While there are few things I know for certain right now, one of them is that not just my world, but the entire world is forever a little darker, less colourful and less full of laughter in his absence.
“We'll just have to work twice as hard to fill it back up again."