Eckstein co-wrote the final episode of 1960s TV series The Fugitive - one of the most watched TV episodes in U.S. history.
He also wrote 10 episodes of the drama, and served as associate producer and co-producer on the series.
He later produced Steven Spielberg 's 1971 TV movie Duel, The Billy Barnes Revue on Broadway and worked as a casting director and business manager before continuing his stellar TV career.
In addition to his credits on The Fugitive, Eckstein produced movies for the small screen including Amelia Earhart and Tail Gunner Joe. He executive produced TV miniseries Masada and TV series Love, Sidney.
His work on The Untouchables launched his TV writing career. He later wrote for series including Dr. Kildare, Gunsmoke, The Invaders and TV movie Perry Mason.
Eckstein was a former board member of the Writers Guild of America and a founding member and a former chairman of the Caucus for Producers, Writers & Directors.
He died on Saturday in Los Angeles.
He is survived by his wife of 41 years, actress Selette Cole, three daughters and two granddaughters.