(November 1979 - 2011) (divorced) (2 children)
In the 1970s he came to Baltimore to act in the Center Stage production of Tartuffe. He remained at Center Stage for some years and often appeared with the late Tana Hicken, most notably as Benedick to her Beatrice in Much Ado About Nothing. He was cast in his first movie role Heaven's Gate, but it required horse riding. O'Quinn took riding lessons from Lori Binkley at Wood Gait Farm in northwest Baltimore County. He took on the role of Captain Minardi in Heaven's Gate, a Western that starred a slew of big names like Kris Kristofferson, Christopher Walken, Jeff Bridges and John Hurt. The movie failed, and is one of the biggest box-office bombs of all time: grossing $3 million on a $44 million budget. However out of the experience O'Quinn married his wife Lori in 1979. They have sons Oliver and Hunter.
Terry and Lori legally separated in 2010, and they divorced shortly thereafter.