BOSTON, Feb. 21, 2014— A Winthrop man accused of holding up a Dunkin Donuts assisted police in their investigation by leaving his cell phone behind as he fled the scene, District Attorney Daniel F. Conley said today.

DENNIS STACK (D.O.B. 12/16/72) was arraigned Tuesday in Charlestown District Court on a charge of armed robbery in connection with the incident late last year.  Judge Robert McKenna granted a request by Assistant District Attorney Ian Leson that bail be set in the amount of $15,000.

According to prosecutors, Boston Police responded to a call for a robbery at a Cambridge Street Dunkin Donuts shortly after noon on Dec. 10.  The assailant ordered the employee to hand over gift cards and cash, claiming he was armed and threatening kill everyone inside the doughnut shop.  As the man attempted to climb over the store’s counter, a customer grabbed him from behind and a brief physical struggle ensued.  The suspect dropped a tire iron and a white iPhone before fleeing the store with $65 from the register, prosecutors said.

The customer was uninjured and was able to describe the getaway vehicle used by the suspect, as were other customers inside the store.

Officers took possession of the phone and observed several incoming phone calls and text messages, including one message addressed to “Dennis,” prosecutors said.  Officers placed a call to one of the phone numbers that appeared on the phone’s screen and spoke with an individual who identified Stack ass the phone’s owner, prosecutors said.

Police compared surveillance images from the robbery with available photos of Stack and identified Stack as the person captured by surveillance cameras committing the armed robbery, prosecutors said.

The Dec. 10 robbery is one of at least four Stack is accused of undertaking in Suffolk county: he has also been charged a Dec. 1 robbery at a Dunkin Donuts in Revere, a Dec. 9 robbery at a Cambridge Street flower shop, and an attempted robbery the same day at a Chelsea hair salon that was thwarted when a clerk told him there was no money in her cash drawer. His bails in those cases ranged from $10,000 to $75,000. He also faces additional robbery charges in Middlesex County.

Stack is represented by Marcus Clay Chamblee.  He will return to court March 24.

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