The couple began dating in 2010 and have an 18-month-old daughter, Lauryn.
"Diana and I have ended our relationship," he told People.com. "However, we are committed to working together to raise our daughter in a healthy and happy environment."
No reason was given for the split.
Martinez is a former cast member of "All My Children" and a winner of "Dancing with the Stars."
Notable deaths of 2014 [PHOTOS]