Aaron Martin is a character who makes a one-time appearance in the Season 2 episode titled "Sins of The Past".
Aaron Martin is Dominic's best friend from the days of his youth on the island of San Remo in the Caribbean. He notified Dominic of the death of his daughter Sally Ann Santini whom he had not seen for many years ever since he was estranged from his wife Lila Santini. At Sally Ann's funeral, Aaron told Dominic that Sally Ann still loved him very much in spite of her mother Lila's hostility toward him.
When Lila was murdered and Dominic was arrested for the crime, Hawke returned to San Remo to clear his name. He met Aaron again. Aaron fills Hawke in on Dominic's past and Lila's dark history. together they go to a house which Dominic had kept all the years in case Sally Ann would come back. Someone tries to break into it. Later, they find the house ransacked. Who are these men and what do they want? Vince Decter tells Hawke of something strange Lila had said: that if anyone came after her, her baby would protect her. Aaron has an idea and wants to meet Hawke at the house. Hawke rushes there but finds Aaron killed by some toughs sent out by Jason Darius. What Aaron had suspected was that Lila kept something in the house which incriminated Darius in something. She had been using that as protection against him.