For some unknown reason, Abel was absent from 12 episodes in The Untouchables' third season.
Plans for a 1981 TV reunion movie featuring Abel and other original Untouchables cast members never came to fruition when star Robert Stack declined to reprise his role as Eliot Ness.
Abel's last credited TV appearance was on an episode of The Fall Guy in 1980.
Abel's record as a professional boxer was 12 wins, 11 losses and 1 draw according to available records.
Abel and Untouchables co-star Bruce Gordon once appeared together on an episode of Bonanza entitled Mr. Henry Comstock.
Abel appeared as Airman Featherstone in the 1958-59 series Steve Canyon before being cast on The Untouchables. Untouchables co-star Jerry Paris also appeared in that series.
Abel played Native American warriors on several episodes of Daniel Boone.
Abel's character on The Untouchables was a former All-American football player but Abel himself never played the sport.
Abel is believed to be residing in Mexico these days and living as a gentleman farmer.
Abel had a small role as a Native American boxer in Humphrey Bogart's last film The Harder They Fall released in 1956.
After his acting career died out, Abel became a producer of films for disadvantaged children.
Abel's character, Agent William Youngfellow, was the one member of the Untouchables' squad who rarely smoked on-screen. All the others smoked like chimneys.
Abel was the tallest member of The Untouchables' cast.
After his discharge from the Army in 1950, Abel became a professional boxer but he quit the sport in 1953 after seriously injuring an opponent in the ring.
Abel took up boxing when he was in the military. He eventually became middleweight champion for the entire Asiatic Theatre of Operations.
Abel joined the Army when he was 16 and was a paratrooper.
Except for star Robert Stack, Abel was the only Untouchable squad member from the show's pilot to be retained for the regular series.
Abel frequently portrayed Native Americans in both the movies and television. His Untouchables character was said to be a full-blooded Cherokee.
Abel's mother died in childbirth when he was born.
Abel's father was of Mexican descent and his mother was a Yakaii Native American.
Abel attended Belmont High School in Los Angeles.
Abel's full name is Abel Gonzalez Fernandez.