“WEYMOUTH, MA A police officer and an innocent bystander were shot and killed in Weymouth Sunday morning. Authorities say Weymouth police received a call around 7:30 a.m. about an erratic driver in the area of South Shore Hospital. The driver was involved in a single-car accident and was seen leaving the car on foot. Officers began searching for the suspect when Officer Michael Chesna, 42, located the suspect, identified as Emanuel Lopes, 20, in the area of Burton Terrace vandalizing a home. Authorities say Chesna got out of his cruiser, drew his firearm and told Lopes to stop when Lopes attacked Chesna with a large stone, striking him in the head.