Question: What was James de la Rosa's promoter convicted of?

Context paragraphs:
Oscar De La Rosa: Oscar De La Rosa (born Oscar De La Rosa Gonzales March 29,1960) is the Latin pop lead singer of the four-time Grammy Award-winning musical group La Mafia.  He is also the brother of Leonardo Gonzales who is the former guitarist of La Mafia and founder of Leonardo Gonzales y Los Magnificos.

Jaime de la Rosa: Tomás de la Rosa (September 18, 1921 - December 2, 1992), also known as his nickname Jaime de la Rosa was a Filipino pre-war and postwar actor better known as Jimmy in Philippine showbiz.

Don King (boxing promoter): Donald King (born August 20, 1931) is an American boxing promoter known for his involvement in historic boxing matchups.  He has been a controversial figure, partly due to a manslaughter conviction (and later pardon), and civil cases against him.

África de la Rosa: África de la Rosa (born 1906) was a Filipina former actress.  She had Spanish and Chinese roots in her family and was the sister of famous Philippine movie icons Rogelio and Jaime de la Rosa.  One of her ancestors was a trusted lieutenant of Fernão de Magalhães (Ferdinand Magellan).

Juan de la Rosa: Juan Pedro de la Rosa (born August 7, 1986 in Tamaulipas, Mexico) is a professional Mexican boxer and is brother to Mexican Top Welterweight boxer, James de la Rosa.

Daniel de la Rosa: Daniel de la Rosa (born July 4, 1993) is a Mexican racquetball player.  De La Rosa won his first International Racquetball Tour (IRT) in December 2014, when he won the 2014 New Jersey Open.  He joins Alvaro Beltran as the only Mexican players to win an IRT TIER 1 event.  De La Rosa was ranked 3rd on the IRT at the end of the 2015-16 season, his fourth season in the top 10.

James de la Rosa: James Micheal de la Rosa (born November 18, 1987) is a Mexican professional boxer from Tamaulipas, Mexico.  He is currently signed with Don King and is a former WBC Youth World champion.

Tony De La Rosa (Tejano musician): Antonio De La Rosa (Sarita, Texas October 31, 1931 - 2004) was an influential Tejano musician.  He was noted for producing dynamic and harmonic accordion runs on the two-row button accordion.  De la Rosa introduced several important innovations into conjunto music, including the practice of slowing polka tempos down to 110—115 beats per minute, as well as the use of amplified bajo sexto and bass.

Louella Persons: Louella Persons is monologue written by Secun de la Rosa which currently runs at La casa de la Portera in Madrid, Spain, starring Natalie Pinot as Louella Persons and directed by Benjamin de la Rosa.

Rogelio de la Rosa: Regidor de la Rosa (November 12, 1916 – November 26, 1986), better known as Rogelio de la Rosa, was one of the most popular Filipino matinee idols of the 20th century.  He is also remembered for his statesmanship, in particular his accomplishments as a diplomat.  Elected to the Philippine Senate from 1957 to 1963, he also was the first Filipino film actor who was able to parlay his fame into a substantial political career, paving the way for other than future Filipino entertainers-turned-politicians such as Senators Eddie Ilarde, Ramon Revilla, Sr., Tito Sotto, Ramon "Bong" Revilla, Jr., Jinggoy Estrada, Lito Lapid, Freddie Webb, and President Joseph Estrada.

Supporting paragraphs: James de la Rosa Don King (boxing promoter)
Answer: manslaughter