Third man arrested for December murder in Dorchester; police say he was the shooter

Boston Police report arresting Amir Richardson, 23, on charges he shot William Davis to death around 1:30 p.m. on Dec. 17 at West Cottage and Dudley streets in Dorchester - two months after another man was shot to death at the same intersection.

Police say homicide and fugitive-apprehension detectives teamed up with the US Marshal's office to find and arrest Richardson (shown right), who faces arraignment in Roxbury Municipal Court today on a charge of murder.

Two weeks ago, police arrested Paul Francis, 24, of Quincy, and Markeese Skinner, 27, of Dorchester, on charges of being accessories after the fact to murder.

Innocent, etc.