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Muhammad Ali

Jim Smeal/WireImage

Scores of celebrities took to social media to pay their respects to Muhammad Ali, who died at age 74.

The three-time world heavyweight champion heavyweight boxing champion, one of the most famous pop culture icons of his time, passed away Friday, a day after he was admitted to a hospital in Phoenix to treat a respiratory ailment.

He had for more than 30 years battled Parkinson's disease, which impaired his speech, but had occasionally stepped out at public events.

Ali, who was born Cassius Clay, won the Light Heavyweight gold medal at the 1960 Summer Olympics in Rome and earned the title of World Heavyweight Champion three times in the '60s and '70s. He retired from boxing in 1981, three years before his Parkinson's diagnosis.

Here's what celebrities said about Ali:

Mike Tyson:

Oscar De La Hoya:

Arsenio Hall, who, along with co-star Eddie Murphy, paid tribute to Ali and poked fun at his name change in a memorable barbershop scene in their 1988 movie Coming to America:

Rest In Peace

A photo posted by Arsenio Hall (@arseniohall) on

Eddie Murphy, Coming to America

Paramount Home Video

LL Cool J:

 

Reba:

Sarah Michelle Gellar

"Float like a butterfly, sting like a bee" #rip #muhammadali #thegreatest

A photo posted by Sarah Michelle (@sarahmgellar) on

Viola Davis

Justin Timberlake

Jennifer Lopez

Yolanda Hadid:

Madonna

Michael J. Fox, who also has Parkinson's disease:

"Muhammad was a true legend—a champion in the boxing ring, and a champion for millions of Parkinson's families," he said in a statement posted on his website of the Michael J. Fox Foundation for Parkinson's Research. "We looked up to him as an example of grace and courage in the face of great challenges. He will be missed."