GAUTIER, Miss. - Police in Mississippi say the man suspected of shooting two people Monday on opposite ends of the state called police after what's believed to be the first shooting and said he'd shot and killed the woman he lived with.

Authorities in Gautier said Shannon Lamb called them around 10 a.m. Monday and said he had shot and killed someone. He did not provide an explanation.

When police got to the scene they found a handwritten note that said: "I am so sorry I wish I could take it back. I loved Amy and she is the only person who ever loved me."

Lamb is accused of killing Amy Prentiss and a professor at Delta State University before eventually taking his own life late Monday.

Washington County Coroner Methel Johnson said Tuesday that Shannon Lamb killed himself about a mile south of his parents' house on the northern outskirts of Greenville. Johnson says Lamb died in the wooded backyard of a home where he knew the residents, after abandoning his still running car.

Johnson also said a .38-caliber handgun was recovered from the same location. A gun of the same caliber was used to kill Schmidt, according to investigators.

Lamb's body is being taken to the state crime lab in Pearl for autopsy, according to the coroner.