Edwin Rosario

Because of the closeness of that bout, the WBA gave Rosario a chance to challenge Livingstone Bramble, one of two other world lightweight champions (the other one being the International Boxing Federation's Jimmy Paul). Rosario went to Miami and defeated Bramble by knockout in the second round to become world lightweight champion for the second time. His pose, raising his arms after the fight, became The Ring magazine's cover for the next month — the only time Rosario was featured on its English-version cover.

Rosario eventually gained a record of 21–0 with 20 knockouts. This led to talks of a title fight against World Boxing Council (WBC) lightweight champion Alexis Argüello, to be held in Miami. But Argüello relinquished the title in order to move up in weight to challenge junior welterweight champion Aaron Pryor.

Rosario was inactive for seven months then went 7–0 with 6 KO's in his next fights. After Chavez vacated the title in 1989, Rosario came back and won it again, beating Anthony Jones, a tough Kronk prospect for the championship.

Rosario was posthumously inducted into the International Boxing Hall of Fame in 2006.

In 1997, he won two comeback fights, then won the Caribbean welterweight title by beating Roger Benito Flores of Nicaragua in Bayamón, Puerto Rico, in a twelve-round decision. Once an HBO staple, Rosario was then fighting on small cards without any TV showings. He was ranked #10 among Oscar De La Hoya's challengers at the welterweight division after his win over Flores, making him an official world title challenger once again.

He defeated Sanford Ricks at Madison Square Garden. In his final fight on September 25, 1997, Rosario knocked out Harold Bennett in two rounds at Bayamon. He died before fighting again.

On December 1, 1997, Rosario visited the home of his ex-wife and four daughters, but he cut his visit short an hour later, saying he felt ill. After returning home where he lived with his parents, Rosario was later found dead in his bed by his father. He was found to have died of an aneurysm on December 1, 1997, with fluid accumulated in the lungs. Doctors said that his history of narcotics and alcohol abuse was a factor.

However, personal problems started to take their toll. In his first defense, against Japanese Akinobu Hiranaka in Mexico City on April 10, 1992, he lost by a 1st-round TKO. He later lost a rematch to Frankie Randall, by technical knockout in seven rounds.

Rosario joined a small group of men who had become world champions three times in the same division. This time, however, he didn't hold the title for long. When he gave Nazario a 1990 rematch at Madison Square Garden, he was defeated on cuts in the 8th round.

Rosario won a comeback fight against Frankie Randall, the future world champion, in London. He had to wait another year before an opportunity to regain the title. On June 13, 1986, he met the world champion Hector 'Macho' Camacho at Madison Square Garden in New York. The fight was televised by HBO, and although Rosario shook Camacho badly in the fifth round and rallied down the stretch, Camacho swept the middle rounds. The judges, in a split decision, awarded Camacho the fight.

He didn't return to the ring until 1984. In his first defense of the title, he faced Roberto Elizondo, who had lasted 7 rounds with Argüello in a previous world title challenge and was expected to give him a tough fight. Rosario knocked out Elizondo in one round. Howard Davis Jr proved more of a challenge – Davis Jr was ahead on all scorecards with ten seconds remaining in the bout, but was dropped by Rosario for the second time in their fight at that point, and lost a split decision.

A rematch with Ramírez was scheduled, again in San Juan, Puerto Rico, on November 3, 1984. Rosario dropped Ramírez once in round one and again in the second, but the challenger got off the canvas to take Rosario's title away with a fourth-round TKO. This was Rosario's first defeat. Some fans felt he never fully recovered, although he won three more championships.

With Arguello moving divisions, Rosario was matched with Mexico's José Luis Ramírez on May 1, 1983 for the vacant WBC lightweight title. Rosario dominated the first 7 rounds, but tired down the stretch to make for a very close fight. The judges, as well as most of the public present, felt Rosario had done enough to win. He became world lightweight champion by the unanimous score of 115–113 on all 3 judging cards. Rosario injured his hand during the fight and needed surgery, for which the World Boxing Council gave him a dispensation.

Chapo's brother Papo died unexpectedly, purportedly due to drugs, two years after his entry into professional boxing. Rosario persevered, wanting to honor his brother's memory by winning a world championship. He scored big knockout wins over Young Ezzard Charles and Edwin Viruet. He beat Charles in three rounds on the Holmes-Cooney undercard in June 1982 in Las Vegas. He also defeated Viruet in three rounds; that opponent had boxed 25 rounds against Roberto Durán-including a world lightweight championship bout-without being knocked out.

Edwin "Chapo" Rosario Rivera (Spanish pronunciation: [ˈeðwin roˈsaɾjo] ; March 15, 1963 – December 1, 1997) was a world champion professional boxer who competed from 1979 to 1997. He won the lightweight championship of the world three times, as the WBC lightweight champion (1983–84), and the WBA champion (1986–87) and (1989–90). Rosario won a 4th world championship after moving up to the junior welterweight division by claiming the WBA title, holding that crown from 1991 to 1992.