Middlesex prosecutors dismiss 33-year-old murder charges

Michael J. Sullivan. –Dana Curhan

A man convicted nearly 33 years ago of the murder of a Cambridge man, and who was released from prison on an ankle bracelet seven years ago, had his case dismissed Friday in Middlesex Superior Court.

Prosecutors said it was virtually impossible for them to successfully retry the case against Michael J. Sullivan, who was found guilty in 1987 for the murder of 54-year-old Wilfred McGrath in an East Cambridge apartment.

“Given that nearly 33 years has passed since the murder, there has understandably been a diminishment of the health and memory of potential witnesses,’’ Middlesex District Attorney Marian T. Ryan said in a statement Friday. “Additionally, a number of the witnesses who testified at trial have died.’’