By CBSBoston.com Staff

SOMERVILLE (CBS) – A man allegedly shot and killed his roommate after an argument at a home on Ware Street in Somerville Wednesday evening.

Police were called to the home at about 5:45 p.m. When officers arrived, they encountered the suspect, 26-year-old Edson Moreno, outside the home with a gun. He was placed under arrest.

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The victim, 22-year-old Robert Favreau, was found inside the home suffering from gunshot wounds. He was pronounced dead at the scene.

Investigators said Moreno was a resident of the home where the shooting occurred and Favreau had been staying there for the last several months.

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“Tonight, the victim and Mr. Moreno allegedly got into a verbal altercation that escalated to the point where the defendant ultimately shot the victim,” Middlesex District Attorney Marian Ryan said Wednesday night.

Ryan said a woman hiding in a closet during the shooting called 911 and told police exactly what was happening before they got there.

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Moreno has been charged with armed assault with intent to murder, assault and battery with a dangerous weapon causing serious bodily injury and possession of a firearm. He will be arraigned Thursday morning in Somerville District Court.

CBSBoston.com Staff