A smiling Muhammad Ali shows his fist to reporters during an impromptu press conference in Mexico City.
Muhammad Ali, along with his wife Lonnie, react to a story told by actor Kevin Costner at the Muhammad Ali Celebrity Fight Night awards banquet in Phoenix. The event raised money for the Muhammad Ali Parkinson Center and other charities
Former President Bill Clinton hugs Muhammad Ali as his wife Lonnie Ali looks on during the grand opening gala celebration of the Muhammad Ali Center at the Kentucky Center for the Arts in Louisville, November 2005
Former world heavyweight boxing champion Muhammad Ali winces as his challenger, Henry Cooper, pretends to land a left hand punch to his jaw. The two, who fought for the world title during their careers, met prior to a charity dinner in celebration of the publication of Ali's biography.
Boxing legend Muhammad Ali sits with his wife, Yolanda, as they await the inauguration ceremony of Barack Obama as the 44th President of the United States
Referee Massimiliano Bianco wears a black armband as a tribute to Muhammad Ali during a boxing match between Ryan Farrag and Karim Guerfi at Liverpool Echo Arena
Members of the Louisville Islamic Center write messages on a memorial banner as they pay their respect to Muhammad Ali, at the Islamic Center in Louisville, Kentucky
Boxing fans tour the Ali Center as they pay their respect to Muhammad Ali at City Hall in Louisville, Kentucky
Justin Bruckmann, of Toronto, shows off his tattoo of Muhammad Ali while visiting a makeshift memorial at Ali Center in Louisville, Kentucky
Fans of Muhammad Ali leave personal mementos as they pay their respects at the Ali Center in Louisville, Kentucky
Members of the Louisville Islamic Center pray together before an inter-faith service to honor Muhammad Ali at the Islamic Center in Louisville, Kentucky
Judges ring the bell 10 times to pay tribute to Muhammad Ali before the WBO Super-Welterweight Title fight between Liam Smith and Predrag Radosevic at Liverpool Echo Arena
Michael Cowden, a long-time friend of Muhammad Ali, shows off pictures from their high school yearbook at Ali Center in Louisville, Kentucky
A red bike hangs as a memorial over the entrance to the old Columbia Auditorium, now Spaulding University, where Muhammad Ali's red bike was stolen at age 12 and led to him meeting Louisville Police Officer Joe Martin and learning to box at Martin's gym in Louisville, Kentucky.
Boxing fans pay their respect to Muhammad Ali at Ali's childhood home in Louisville, Kentucky.
Russell David looks over all the flowers and mementos as he pays his respect to Muhammad Ali at Ali Center in Louisville, Kentucky
Franciscan Friars of the Renewal (L) from New York talk with long time friend of Muhammad Ali, Sonny Fishback (R), as they pay their respects at Ali's childhood home in Louisville, Kentucky
A man wears a t-shirt with a photo of Muhammad Ali during a tribute in Harlem, New York
Fans of the late Muhammad Ali, the former world heavyweight boxing champion come to pay their respects at the Ali Center in Louisville, Kentucky
Fans of Muhammad Ali look over flowers, pictures and personal mementos as they pay their respects at the Ali Center in Louisville, Kentucky
Mona Aner, a member of the Louisville Islamic Center, takes a picture of her message on the memorial banner to Muhammad Ali at the Islamic Center in Louisville, Kentucky
The Washington Nationals stand on the field during a moment of remembrance for Muhammad Ali before a game against the Cincinnati Reds at Great American Ball Park
Todd Fortwengler and his sons pay their respect to Muhammad Ali at the Ali Center in Louisville, Kentucky.
Employees of Joe's Pizza build a makeshift memorial to the late Muhammad Ali near a mural in New York
A memorial to honor Muhammad Ali is seen at the Louisville Islamic Center in Louisville, Kentucky
Muhammad Ali eats a piece of his birthday cake as boxer Mike Tyson looks at the MGM Grand hotel in Las Vegas. Ali was celebrating his 57th birthday
Former heavyweight boxing legend Muhammad Ali performs a magic trick during a charity gala in Hamburg, Germany
Laila Ali hugs her father after winning her super-middleweight fight against Asa Sandell of Sweden in Berlin.
Muhammad Ali accepts the President's Award accompanied by his wife Yolanda Williams at the 40th Annual NAACP Image Awards
Muhammad Ali and actor Denzel Washington pose for photographers at the 'Boys & Girls Clubs of America' annual President's dinner, in New York
Muhammad Ali and his wife Lonnie follow the super-middleweight fight of his daughter boxer Laila Ali against Asa Sandell of Sweden in Berlin.
Muhammad Ali is assisted as he enters the funeral for boxer Joe Frazier at the Enon Tabernacle Baptist church in Philadelphia, November 2011
Muhammad Ali jabs at photographers while arriving at the Orpheum Theatre for the premiere of the film "Collateral" in Los Angeles.
Muhammad Ali poses during the World Economic Forum in Davos, Switzerland
Muhammad Ali poses with a copy of his book, The Greatest Of All Time, at the Frankfurt book fair.
Muhammad Ali poses with an enlarged copy of a new Wheaties cereal box adorned with his photo at a press conference in New York.
Muhammad Ali puts himself jokingly on guard upon being greeted by boxing promoter Don King
Muhammad Ali watches during the first quarter of the 2009 NBA All-Star basketball game in Phoenix
Former world heavyweight boxing champion Muhammad Ali watches his 21-year-old daughter Laila Ali in her debut as a professional boxer. Laila beat middleweight opponent April Fowler in a first round knockout.
Muhammad Ali, a Gold Medal winner in boxing in the 1960 Olympics when his name was Cassius Clay, holds up the torch during the opening ceremonies of the XXVI Centennial Olympic Games in Atlanta
Pope John Paul II and former Muhammad Ali sign autographs for each other at the end of their meeting at the Vatican
President George W. Bush awards Muhammad Ali with the Presidential Medal of Freedom, as Ali's wife Lonnie watches