Muhammad Ali Final Years: Illness, Death, Legacy

Few athletes have ever transformed their sport and their culture the way Muhammad Ali did. But for all his fame in the ring and his moral stands outside it, his final years tell a quieter, more difficult story—one of a body and mind slowly yielding to Parkinson’s disease.

Professional boxing record: 56 wins (37 KOs), 5 losses ·
Diagnosed with Parkinson’s: 1984, age 42 ·
Heavyweight champion years: 1964–1967, 1974–1978, 1978–1979 ·
Height: 6 ft 3 in (191 cm) ·
Known as: The Greatest, Cassius Clay (birth name)

Eight key facts that define Muhammad Ali’s life and final years, from his birth to his death and everything in between.

What happened to Muhammad Ali before he died?

Parkinson’s disease diagnosis and progression

• Ali was first diagnosed with Parkinson’s disease in 1984 at age 42, after checking into Columbia-Presbyterian Medical Center in September of that year (Science of Parkinson’s).
• By the time of diagnosis, he already had tremors, slowness of movement, slurred speech, and unexplained fatigue (PBS report).
• His treating neurologists at the University of Florida described a 34-year chronic progressive presentation consistent with idiopathic Parkinson’s disease, not atypical parkinsonism (University of Florida).

Loss of speech in final years

• By 2014, Ali’s voice had become barely audible above a whisper (Nebraska Medicine).
• The disease affected both his movement and his vocal cords, making public appearances increasingly difficult (Science of Parkinson’s).

Respiratory complications leading to death

• In early June 2016, Ali was hospitalized in Phoenix, Arizona, for a respiratory issue complicated by a urinary tract infection (Encyclopaedia Britannica).
• He died on June 3, 2016 from septic shock stemming from the UTI; his death certificate lists Parkinson’s as an underlying cause (History.com).

Has Ali ever lost a fight?

Number of career losses: 5

• Ali’s professional record stands at 56 wins (37 by knockout) and 5 losses (Encyclopaedia Britannica).
• His final fight was a loss to Larry Holmes on October 2, 1980 (Encyclopaedia Britannica).

Losses by opponent

• Joe Frazier (1971, 1974): The “Fight of the Century” in 1971 was Ali’s first professional defeat. Frazier won by unanimous decision. Ali avenged it in 1974.
• Ken Norton (1973): Norton broke Ali’s jaw en route to a split decision victory.
• Leon Spinks (1978): In an upset, Spinks took Ali’s heavyweight title by split decision.
• Larry Holmes (1980): An aging Ali was stopped in the 11th round, his only loss inside the distance.

Significance of each loss in his career arc

• Ali’s losses to Frazier and Norton came during his prime and forced him to evolve his style.
• His loss to Spinks was avenged seven months later—Ali became the first three-time heavyweight champion.
• The Holmes loss marked the end of his career; many medical observers later noted the punishment he took in that fight accelerated his neurological decline (Science of Parkinson’s).

What caused Muhammad Ali’s brain damage and illness?

Head trauma from boxing and Parkinson’s disease link

• Many neurologists have argued that Ali’s repeated head trauma from boxing likely contributed to or triggered his Parkinson’s (Science of Parkinson’s).
• No definitive study proves boxing causes Parkinson’s, but the correlation is widely accepted in the medical community.
• Ali declined an autopsy before his death, so no post-mortem tissue diagnosis was possible (University of Florida).

Young-onset idiopathic Parkinsonism

• Ali’s treating physicians classified his illness as young-onset idiopathic Parkinson’s disease (YOPD), meaning it arose with no single identifiable cause (University of Florida).
• The diagnosis was made after days of testing at Columbia-Presbyterian Medical Center in 1984 (PBS).

Ali’s IQ: claimed 78 in a 1975 test

• Ali reportedly scored 78 on an Army-administered IQ test during a pre-draft physical, but the original document was never released publicly.
• The score has been cited in biographies but remains unverified by any official military or medical record.

Why did Ali refuse to go to Vietnam and why did his wife leave him?

Ali’s 1967 draft refusal for religious and moral reasons

• Ali refused induction into the U.S. armed forces in 1967 on the grounds of his Islamic faith and his opposition to the Vietnam War (History.com).
• He was stripped of his boxing titles and license, and sentenced to five years in prison (Encyclopaedia Britannica).
• The U.S. Supreme Court overturned his conviction in 1971 in the case Clay v. United States (Oyez (Supreme Court archive)).

Khalilah Ali (formerly Belinda Boyd) marriage and divorce

• Ali married Belinda Boyd in 1967 (she later changed her name to Khalilah Ali). They had four children together.
• The couple divorced in 1977, with Khalilah citing “irreconcilable differences” and Ali’s extramarital affairs as contributing factors.
• Ali had nine children total: seven daughters and two sons.

Ali’s later marriages and family

• Ali married Veronica Porché in 1977 (divorced 1986), then Yolanda (“Lonnie”) Williams in 1986, who remained with him until his death.

Who are the four kings of boxing and what boxer went 89–0?

Four Kings: Leonard, Hagler, Hearns, Duran

• The “Four Kings” of boxing are Sugar Ray Leonard, Marvelous Marvin Hagler, Thomas Hearns, and Roberto Duran.
• They dominated the welterweight and middleweight divisions in the 1980s, an era often called the last golden age of boxing.

Context: 1980s welterweight/middleweight golden era

• Each of the Four Kings fought at least two of the others in iconic bouts—Leonard vs. Hagler, Leonard vs. Duran (twice), Hearns vs. Duran, and Hagler vs. Hearns.

Julio César Chávez’s 89–0 record

• Mexican legend Julio César Chávez compiled an 89–0 record before his first loss (Encyclopaedia Britannica).
• Ali never reached 89–0; his career ended at 56–5, but he faced significantly tougher competition through multiple heavyweight eras.

What to know about Muhammad Ali’s death and his real name?

Birth name: Cassius Marcellus Clay Jr.

• Ali was born Cassius Marcellus Clay Jr. in Louisville, Kentucky, on January 17, 1942.
• He changed his name to Muhammad Ali in 1964 after converting to the Nation of Islam (Encyclopaedia Britannica).

Death details: June 3, 2016, Phoenix, AZ

• Ali died at age 74 on June 3, 2016, at a Phoenix-area hospital from septic shock caused by a urinary tract infection (History.com).
• His body was buried at Cave Hill Cemetery in Louisville after a funeral procession through his hometown.

Legacy: Ali Center in Louisville

• The Muhammad Ali Center in Louisville, Kentucky, opened in 2005 and serves as a museum and community center dedicated to his values of peace, social justice, and personal growth (Ali Center).
• Ali lit the Olympic cauldron at the 1996 Atlanta Games in a moment that symbolized his enduring public role despite his physical decline (Olympics.com).

Muhammad Ali timeline: 1942–2016

• 1942–1960: Born in Louisville; wins Olympic gold medal in light heavyweight division at the 1960 Rome Games (Olympics.com).
• 1964–1967: Wins heavyweight title from Sonny Liston; changes name to Muhammad Ali; refuses draft induction; stripped of title (History.com).
• 1970–1979: Returns to boxing; Fight of the Century (loss to Frazier); Rumble in the Jungle (beats Foreman); Thrilla in Manila (beats Frazier); wins title for third time (Encyclopaedia Britannica).
• 1980–1984: Final fight (loss to Holmes); retires; diagnosed with Parkinson’s at age 42 (Science of Parkinson’s).
• 1984–2016: Slow neurological decline; voice loss; limited public appearances; death at 74 from septic shock.

What we know and what remains unclear

Confirmed facts

• Ali died from septic shock secondary to a urinary tract infection (History.com).
• He was diagnosed with Parkinson’s syndrome in 1984 at age 42 (Science of Parkinson’s).
• He refused the Vietnam draft on religious and moral grounds (History.com).
• His professional record is 56 wins (37 KOs) and 5 losses (Encyclopaedia Britannica).
• He had 9 children and was married 3 times.

What remains unclear

• Exact IQ score (the reported 78 from a draft test was never officially confirmed by military records).
• Whether boxing head trauma was the sole cause of his Parkinson’s (his treating neurologists classified it as idiopathic, but the link to repeated head injury is widely suspected) (University of Florida).
• The exact timeline of Ali’s speech loss in his final months (reports vary on when he stopped speaking entirely).
• Private conversations between Ali and his wife Lonnie before his death remain personal and unreported.
• No post-mortem tissue diagnosis was possible because Ali declined an autopsy before his death (University of Florida).

In his own words and others’

“I shook up the world! I shook up the world!”

— Muhammad Ali, moments after defeating Sonny Liston in 1964

“He’s not the greatest … I am.”

— Joe Frazier, reflecting on his rivalry with Ali

“I ain’t got no quarrel with them Viet Cong. No Viet Cong ever called me n*****.”

— Muhammad Ali, explaining his draft refusal in 1967 (History.com)

The pattern across these voices is clear: Ali spent his life challenging the world. But the final challenge—the one he could not talk or fight his way out of—was the disease that stilled his voice and, eventually, his heart.

Frequently asked questions

For readers exploring similar stories of athletes facing health battles, the account of Robin Smith: Illness, Career, Family & Why He Was Called Judge offers another look at how sports careers intersect with personal health challenges. And for a profile of a modern athlete navigating the end of his career, Nat Fyfe Retired: Career, Salary, and What He’s Doing Now provides a contemporary contrast to Ali’s era.

Muhammad Ali’s final years offer no tidy moral. He was the greatest boxer of all time, and the sport that made him took a heavy price from his body. For every young boxer who dreams of being “The Greatest,” the real takeaway is this: the same punch that wins a title may also land years later, in a quiet hospital room, long after the crowd has gone home.