PITTSFIELD, Mass. — A prosecutor says a Massachusetts police officer who shot and killed a man charging at him with a knife will not face criminal charges.

Berkshire District Attorney David Capeless announced Wednesday that Pittsfield Officer Christopher Colello “acted lawfully in defense of his fellow officers” when he shot and killed Daniel Gillis on Sept. 1.

Colello was one of several officers who responded to a domestic violence call from the 36-year-old Gillis’ girlfriend, who said he was upset and intoxicated after being fired.

Capeless says Gillis emerged from his home with the knife held to his throat and charged at police, ignoring orders to drop the weapon. Gillis was shot seven times.

Capeless says his investigation was aided by a cellphone video of the shooting taken by a neighbor.

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