Darcy O'Brien (July 16, 1939, in Los Angeles, California – March 2, 1998, in Tulsa, Oklahoma) was an award-winning American author of fiction and literary criticism, most well known for his work in the genre of true crime.
Darcy O'Brien was born in Los Angeles, the son of Hollywood silent film actor George O'Brien and actress Marguerite Churchill, a frequent co-star of John Wayne.
His sister is Orin O'Brien, a double bassist and member of the New York Philharmonic.
O'Brien died of a heart attack[3] in Tulsa on March 2, 1998.
O'Brien was inducted into the Oklahoma Writers Hall of Fame in 1997.