Background: George Edward Foreman (born January 10, 1949) is an American former professional boxer who competed from 1969 to 1977, and from 1987 to 1997. Nicknamed "Big George", he is a two-time world heavyweight champion and an Olympic gold medalist. Outside the sport he is an ordained minister, author, and entrepreneur. After a troubled childhood Foreman took up amateur boxing and won a gold medal in the heavyweight division at the 1968 Summer Olympics.
Context: In 1972, still undefeated and with an impressive knockout record, Foreman was set to challenge undefeated and Undisputed World Heavyweight Champion Joe Frazier. Despite boycotting a title elimination caused by the vacancy resulting from the championship being stripped from Muhammad Ali, Frazier had won the title from Jimmy Ellis and defended his title four times since, including a 15-round unanimous decision over the previously unbeaten Ali in 1971 after Ali had beaten Oscar Bonavena and Jerry Quarry. Despite Foreman's superior size and reach, he was not expected to beat Frazier and was a 3:1 underdog going into the fight.  The Sunshine Showdown took place on January 22, 1973, in Kingston, Jamaica, with Foreman dominating the fight to win the championship by technical knockout. In ABC's re-broadcast, Howard Cosell made the memorable call, "Down goes Frazier! Down goes Frazier! Down goes Frazier!" Before the fight Frazier was 29-0 (25 KO) and Foreman was 37-0 (34 KO). Frazier was knocked down six times by Foreman within two rounds (the three-knockdown rule was not in effect for this bout). After the second knockdown, Frazier's balance and mobility were impaired to the extent that he was unable to evade Foreman's combinations. Frazier managed to get to his feet for all six knockdowns, but referee Arthur Mercante eventually called an end to the one-sided bout.  Foreman was sometimes characterized by the media as an aloof and antisocial champion. According to them, he always seemed to wear a sneer and was not often available to the press. Foreman later attributed his demeanor during this time as an emulation of Sonny Liston, for whom he had been an occasional sparring partner. Foreman defended his title successfully twice during his initial reign as champion. His first defense, in Tokyo, pitted him against Puerto Rican Heavyweight Champion Jose Roman. Roman was not regarded as a top contender, and it took Foreman only 2 minutes to end the fight, one of the fastest knockouts in a Heavyweight Championship bout.
Question: Did he win by knock out?. Whats the answer?
dominating the fight to win the championship by technical knockout.