When Chesna approached Lopes, court documents say Lopes picked up a large rock and charged at the officer. Police say when Lopes hit Chesna with the rock, Chesna fell to the ground and dropped his gun.
According to court documents, Lopes picked up the gun and shot Chesna 10 times as he stood over him. Witnesses told police Lopes stood over Chesna and shot him five times in the head and five times in the chest.
Police say Lopes then moved through the neighborhood, pausing in one backyard to shoot through a large picture window on the back of home. According to police, one of those shots hit a 77-year-old woman named Vera Adams in the chest, killing her.
Lopes was eventually arrested and police say there were no bullets left in the gun.
According to the Norfolk County District Attorney's Office, Lopes was slated to be arraigned Monday afternoon from his hospital bed, but was not medically able to be arraigned.
The arraignment was expected to take place Tuesday.