Muhammad Ali's funeral slated for Friday in Louisville, preceded by public procession

Remembering Muhammad Ali's legacy (10:13)

Muhammad Ali, the legendary, three-time heavyweight champion, has died at the age of 74. Ali had Parkinson's disease. (10:13)

Muhammad Ali's funeral will be held Friday in his hometown of Louisville, Kentucky, and will be preceded by a public procession.

Bob Gunnell, a spokesman for Ali's family, announced the funeral arrangements Saturday afternoon, less than 24 hours after the three-time heavyweight boxing champion and sports icon died at the age of 74.

Gunnell said Ali died at 12:10 a.m. ET Saturday from septic shock due to unspecified natural causes. Ali spent the last hour of his life surrounded by his family after initially being hospitalized in the Phoenix area on Monday.

The family "certainly believes that Muhammad was a citizen of the world ... and they know that the world grieves with him,'' Gunnell said.

A procession starting at 9 a.m. ET on Friday will carry Ali's body down an avenue that bears his name, through his boyhood neighborhood and down Broadway, the scene of the parade that honored the brash young man -- then known as Cassius Clay -- for his gold medal at the 1960 Olympics.

After the procession, a memorial service is scheduled for 2 p.m. ET at the KFC Yum! Center and will also be open to the public. Eulogies will be given by former President Bill Clinton, Bryant Gumbel and Billy Crystal, who famously has done a masterful impression of Ali.

The ceremony will be led by an imam in the Muslim tradition but will include representatives of other faiths. Utah Sen. Orrin Hatch will represent Mormons.

"Muhammad Ali was clearly the people's champion,'' Gunnell said, "and the celebration will reflect his devotion to people of all races, religions and backgrounds.''

Gunnell said Ali "did not suffer" in the hours prior to his death and described Ali's final moments with his family as "solemn" but "beautiful."

"The champ would have been proud of his family," Gunnell said.

Hana Ali, one of Ali's daughters, described her father's last moments in a social media post earlier Saturday, saying his heart continued to beat for about 30 minutes after all of his other organs failed. She wrote on her Instagram and Twitter accounts that "no one had even seen anything like it.''

In Louisville, not even pouring rain Saturday could stop the flood of tributes for "The Greatest.''

In the three-time heavyweight champion's old neighborhood, his brother, Rahaman Ali, stood in a small house on Grand Avenue and dabbed his eyes as he shook hand after hand. The visitors had come from as far away as Georgia and as near as down the street.

"God bless you all,'' the 72-year-old Rahaman said to each.

Ali's death held special meaning in Louisville, where he was the city's favorite son.

"He was one of the most honorable, kindest men to live on this planet,'' his brother said while greeting mourners at their childhood home, recently renovated and turned into a museum.

Cars lined both sides of the Louisville street where Ali grew up. The guests piled flowers and boxing gloves around the marker designating it a historical site. They were young and old, black and white, friends and fans. Another makeshift memorial grew outside the Muhammad Ali Center downtown, a museum built in tribute to Ali's core values: respect, confidence, conviction, dedication, charity, spirituality.

"Muhammad Ali belongs to the world,'' Louisville Mayor Greg Fischer said at a memorial service outside Metro Hall. "But he only has one hometown.''

Rahaman recalled what Ali was like as a boy named Cassius Marcellus Clay Jr., long before he became the most famous man in the world, the Louisville Lip, celebrated as much for his grace and his words as his lightning-fast feet and knockout punch.

In their little pink house in Louisville's west end, the brothers liked to wrestle and play cards and shoot hoops.

"He was a really sweet, kind, loving, giving, affectionate, wonderful person,'' Rahaman said, wearing a cap that read "Ali,'' the last letter formed by the silhouette of a boxer ready to pounce.

When Ali was 12 years old, he had a bicycle that was stolen and he told a police officer he wanted to "whup'' whoever took it, Fischer said at the memorial service. The officer told him he'd have to learn how to box first.

Daniel Wilson was one year behind Ali at Central High School and remembered he was so committed to his conditioning that he didn't get on the school bus like everybody else. Instead, he ran along beside it, three miles all the way to school each morning.

"The kids on the bus would be laughing and Ali would be laughing, too,'' he recalled at the Grand Avenue home.

Ruby Hyde arrived at the memorial holding an old black-and-white framed photo of a young Ali. She had been a water girl at his amateur bouts as a teenager in Louisville, and had seen even then that there was something special, something cerebral, about the way he fought.

Years later, he came back to the old neighborhood as a heavyweight champ, driving a Cadillac with the top down.

"All the kids jumped in and he rode them around the block,'' she remembered. He never forgot where he came from, she said.

"He's done so much for Louisville. He's given us so much,'' said Kitt Liston, who as a girl growing up in Louisville admired Ali's unblinking fight for justice and peace. "He's truly a native son. He's ours.'' Liston's voice trembled as she recounted running into him at a baseball game a few years ago.

"I got to tell him how much I cared about him. He put that big ol' paw out and just shook my hand,'' she said. "He just had time for everybody.''

The mayor ordered the city's flags at half-staff. Outside Metro Hall, Fischer pointed west, toward Ali's childhood home, about three miles away in one of the city's poorest ZIP codes.

"There can only be one Muhammad Ali, but his journey from Grand Avenue to global icon serves as a reminder that there are young people with the potential for greatness in the houses and neighborhoods all over our city, our nation, our world,'' he said. Fischer told mourners to teach all children Ali's legacy: that a kid from Kentucky can grow up to be "The Greatest.''

"That's how we become champions,'' he said. "Muhammad Ali has shown us the way.''

Retired from boxing since 1981, Ali battled Parkinson's disease for decades. He had been hospitalized a few other times in recent years, including in early 2015 because of a severe urinary tract infection initially diagnosed as pneumonia.

The Associated Press contributed to this report.