Forty-years later, Costello was living in Arizona but was arrested on a trip back to New York State after his sister learned from one of Costello's former girlfriends that he had killed "Mary's boyfriend" and turned him in to police.
Murphy said he was extremely happy with the resolution of this "difficult case" and "this case has been 40 years in the discovery and two years in the investigation. Finally, today, we have concluded a major chapter in this family's life. Let's hope the next chapter is one of healing and peace."
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