BOSTON, March 27, 2013—A Boston man will spend the rest of his life in prison for murdering 29-year-old Erica Field and trying to murder her boyfriend in a Dorchester parking lot, Suffolk County District Attorney Daniel F. Conley said today.

AMOS “ACE” DON (D.O.B. 3/11/86) was convicted yesterday and sentenced today for first-degree murder in Field’s Aug. 25, 2009, homicide. That crime carries a mandatory term of life in prison without the possibility of parole, which was imposed by Suffolk Superior Court Judge Christine McEvoy this morning.

Assistant District Attorney Ian Polumbaum of Conley’s Homicide Unit recommended additional terms of 15 to 20 years in state prison for armed assault with intent to murder and 13 to 15 years for aggravated assault and battery with a dangerous weapon, for which Don was also convicted yesterday, asking that they run “symbolically” from and after the life term. McEvoy imposed the requested sentences, but ordered them to run concurrent with the life term.

“This was a cold-blooded murder committed because one man valued drug money more than human life,” Conley said. “I can only hope that Erica’s family can find some small measure of satisfaction that justice was done on her behalf.”

Polumbaum proved during six days of trial that Field’s boyfriend sold drugs in Maine for Don, who lived in Dorchester. Field was not involved in the enterprise. In August 2009, a large quantity of Don’s heroin was stolen, and at about the same time, Field’s boyfriend sought to buy a large quantity of cocaine.

Polumbaum argued that Don set up Field and her boyfriend, intending to take the boyfriend’s money to pay off his own supplier. Toward that end, Don arranged a drive to Boston on Aug. 25. With Field and her boyfriend in the front seats, Don directed them to a truck lot on Norwell Street and shot them both in the head. Field was killed; her boyfriend was found in critical condition and spent several weeks in a coma.

Conley lauded the Lewiston Police detectives who worked hand in hand with Boston Police and Suffolk prosecutors throughout the investigation.

“Jurisdictionally, this wasn’t their case,” Conley said, “but they gave it everything they had for Erica and her family.”

Katherine Moran was the DA’s assigned victim-witness advocate. Don was represented by attorney Stephen Weymouth.

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All defendants are presumed innocent until and unless proven guilty beyond a reasonable doubt.