Comedian Billy Crystal imitates Muhammad Ali during his memorial service Friday in Louisville, Ky.

Pallbearers place Muhammad Ali's casket in the hearse as it prepares to begin a procession through the fighter's hometown of Louisville, Ky., on Frida. Ali died last Friday at age 74 after a long battle with Parkinson's disease.

Muhammad Ali's daughter Rasheda Ali-Walsh speaks during his memorial service Friday in Louisville, Ky.

Muhammad Ali's daughter Rasheda Ali-Walsh cries after speaking during his memorial service Friday in Louisville, Ky.

Muhammad Ali's wife, Lonnie Ali, speaks during his memorial service Friday in Louisville, Ky.

Imam Zaid Shakir introduces speakers during Muhammad Ali's memorial service Friday in Louisville, Ky.

Former President Bill Clinton delivers a eulogy during Muhammad Ali's memorial service Friday in Louisville, Ky.

Muhammad Ali's daughter Marylum Ali speaks during his memorial service Friday.

Natasha Mundkur, a 19-year-old volunteer with the Muhammad Ali Center, speaks during Muhammad Ali's memorial service Friday in Louisville, Ky.

Boxing promoter Don King arrives for Muhammad Ali's memorial service Friday in Louisville, Ky.

Nick Smith, of Louisville, poses for a photograph holding a drawing of Muhammad Ali as spectators wait for the arrival of Ali's funeral procession to enter Cave Hill Cemetery Friday in Louisville, Ky. Ali died last Friday at age 74 after a long battle with Parkinson's disease.

A woman reaches out to touch a hearse as Muhammad Ali's funeral procession passes onlookers lining a street along the 19-mile route Friday in Louisville, Ky.

An audience member arrives for Muhammad Ali's memorial service Friday in Louisville, Ky.

Muhammad Ali's funeral procession passes as onlookers line the street Friday in Louisville, Ky.

Gerald Wayne Jacobs of Louisville is consoled by strangers as he cries at the gates of Cave Hill Cemetery in Louisville, Ky., on Friday. Jacobs and hundreds of others watched as Muhammad Ali’s funeral procession went by to lay the boxing champ to rest.

A mourner holds a photo of Muhammad Ali as she waits for the procession to pass with the hearse carrying his body Friday in Louisville, Ky.

Joseph Robinson sweeps the street before a funeral procession begins for Muhammad Ali on Friday in Louisville, Ky.

The hearse carrying the body of Muhammad Ali passes in front of his boyhood home during his funeral procession Friday in Louisville, Ky. Ali's home was the second house from the left.

Toya Johnson looks at the flowers and balloons left at the boyhood home of Muhammad Ali on Friday in Louisville, Ky.

People watch as the funeral procession for Muhammad Ali passes in front of his boyhood home Friday in Louisville, Ky.

Actor Will Smith, who played Muhammad Ali in the film "Ali," greets a fan during the funeral procession for Ali in Friday in Louisville, Ky.

Muhammad Ali's funeral procession passes as onlookers line the street Friday in Louisville, Ky.

A girl rushes to touch the hearse carrying the body of boxing legend Muhammad Ali as the funeral procession winds through his hometown of Louisville, Ky., on Friday.

The hearse carrying the body of Muhammad Ali passes by a mural depicting "The Greatest of All Time" on East Broadway on Friday in Louisville, Ky.