Skip to main content
Press Release

Boston Man Sentenced for Role in Armed Robbery of Brockton Cell Phone Store

For Immediate Release
U.S. Attorney's Office, District of Massachusetts
Co-defendants shot at Brockton Police during high-speed chase while fleeing the scene

BOSTON – A Boston man was sentenced yesterday in federal court in Boston for his role in the January 2019 robbery of a T-Mobile store in Brockton and shooting at police officers as he and his co-defendants fled the scene.

Dennis Martin, 27, of Brockton, was sentenced by U.S. Senior District Court Douglas P. Woodlock to eight years in prison and three years of supervised release. In August 2019, Martin pleaded guilty to conspiracy to interfere with commerce by robbery; interference with commerce by robbery; brandishing, using and carrying a firearm in relation to a crime of violence; and being a felon in possession of a firearm and ammunition.

Martin was charged in 2019 along with co-conspirators Stephan Rosser-Stewart, Darius Carter and Diovanni Carter.

On the evening of Jan. 26, 2019, Martin, Rosser-Stewart and Darius Carter entered a T-Mobile store in Brockton, carrying semi-automatic firearms, which they pointed at the store manager as they demanded cash and electronics. Darius Carter struck the store manager in the head with a firearm. The men stole approximately $25,000 in cash and electronics and then fled in a vehicle driven by Diovanni Carter.

Police located the getaway vehicle and a high-speed chase ensued, reaching speeds of over 70 mph in residential neighborhoods. During the chase, Diovanni Carter ordered the other men in the car to fire at pursuing police cruisers. Rosser-Stewart and Darius Carter fired a total of eight rounds at the pursuing police cruisers. Law enforcement apprehended Martin, Rosser-Stewart and Darius Carter after an object on the road disabled their vehicle and recovered the stolen phones, cash and the three firearms used in robbery. Diovanni Carter fled the scene when the car was stopped and was later apprehended in March 2019. Martin, Rosser-Stewart, Darius Carter and Diovanni Carter were each prohibited from possessing firearms and ammunition due to prior criminal convictions. Martin was previously convicted of armed robbery.

On Sept. 8, 2022, Rosser-Stewart, was sentenced to 16 years in prison and two years of supervised release. In March 2021, Darius Carter pleaded guilty and was sentenced to 14 years in prison and three years of supervised release after pleading guilty to his role in the robbery. In March 2020, Diovanni Carter was convicted by a federal jury and sentenced to over 22 years in prison.

United States Attorney Rachael S. Rollins; James Ferguson, Special Agent in Charge of the Bureau of Alcohol, Tobacco, Firearms & Explosives, Boston Field Division; Joseph R. Bonavolonta, Special Agent in Charge of the Federal Bureau of Investigation, Boston Division; Douglas Bartlett, Acting U.S. Marshal of the District of Massachusetts; Colonel Christopher Mason, Superintendent of the Massachusetts State Police; Plymouth County District Attorney Timothy J. Cruz; Plymouth County Sheriff Joseph D. McDonald Jr.; and Brockton Police Chief Brenda Perez made the announcement. Assistant U.S. Attorney Philip A. Mallard of Rollins’ Organized Crime & Gang Unit prosecuted the case.

This case is part of Project Safe Neighborhoods (PSN), a program bringing together all levels of law enforcement and the communities they serve to reduce violent crime and gun violence, and to make our neighborhoods safer for everyone. On May 26, 2021, the Department launched a violent crime reduction strategy strengthening PSN based on these core principles: fostering trust and legitimacy in our communities, supporting community-based organizations that help prevent violence from occurring in the first place, setting focused and strategic enforcement priorities, and measuring the results.

Updated September 29, 2022

Violent Crime