MARSHFIELD, MA — Massachusetts State Police are searching for a man they say killed his estranged wife.

Police are searching for Allen Warner, 47, of Rockland, Massachusetts. Warner is suspected of killing his soon to be ex-wife.

The woman, whose identity has not yet been released, was found critically wounded in her car at about 6 p.m. on Monday on Main Street in Marshfield. She was rushed to South Shore Hospital with what police believe was a gunshot wound to the face. The woman was pronounced dead at the hospital.

Plymouth County District Attorney Timothy Cruz said the woman phoned police shortly before the shooting to report that her estranged husband was following her.

Warner is believed to be driving a gray 2013 Toyota Corolla with a Massachusetts license plate of 4FSZ80. Warner is a white man, about 5 feet 9 inches tall, with blue eyes and long red or blonde hair.

Police do not yet have an active warrant for Warner's arrest, naming him only as a "person of interest" in the slaying. Law enforcement officers are asked to "stop and hold" Warner if he is located.

Residents in the Marshfield area were instructed to stay in their homes and lock their doors shortly after the shooting.

Police say Warner is considered armed and dangerous.

Anyone with information on his whereabouts is asked to immediately call 911.