Dominic has been married twice. His first married life was dissolved. He is also the father of six children. On 8th of June 2003, he got married for the second time in his life with Jane Pittson. They are still together.
Dominic began her career as an Off-Broadway actor. During his early days, he appeared in several Off-Broadway theatre productions. He also took acting classes at HB Studio. In 1965, he made his Broadway debut in Oliver!. Besides acting, he is also an avid guitarist and he used to collect his personal income by playing rhythm guitar in various restaurants. After appearing in several Broadway productions, he finally made his professional acting debut in 1972 comedy movie, Fuzz. Two years later, she appeared in the movie, The Godfather Part II. His net worth is said to be around $15 million.