CABOOL, Mo. — Local law enforcement are on alert as a manhunt continues for a Missouri man charged with the murder of his wife.

Daniel Chapman, 54, is wanted in connection with the murder of his wife, 55-year-old Sandra Chapman, who was found dead on Aug. 11 on the floor of a Sinclair gas station the couple owned.

Officials with the Beatrice Police Department and Gage County Sheriff’s Department were notified of the murder last week due to the fact that Daniel Chapman’s mother lives in Beatrice and he attended Wymore High School. Authorities said Chapman is also believed to still have a sister living in the area.

“We’re working with Cabool authorities,” Beatrice Police Department Captain Gerald Lamkin said Tuesday. “They’re tracking him and trying to locate him. To my understanding his mom lives here. The last we had heard, he was not believed to be in the state.”

Gage County Sheriff Millard “Gus” Gustafson said his office was also notified of the murder and Chapman’s local connection.

According to law enforcement, Chapman’s last known location was western Kansas. Texas County (Mo.) Sheriff Carl Watson told the Houston (Mo.) Herald that Chapman used his cell phone near a small Kansas town Saturday. Chapman had previously used his cell phone at locations in Arkansas and Oklahoma since he allegedly shot and killed his wife.

A probable cause statement obtained by the Houston Herald, signed by Sgt. Jerald Sigman of the Cabool Police Department, shed light into the alleged murder.

According to a witness, the Chapmans were inside the gas station on U.S. Business 60, when a gentleman pulled up to the door. He told authorities he took two steps toward the business before he was waved off by Dan Chapman. The witness said Sandy ran toward the front door, and he saw Dan Chapman fire a shot at her with a black semi-automatic pistol.

The witness said he heard at least four more shots fired as he ran for safety at a nearby car wash.

After about five minutes, the witness told police he saw Dan Chapman leave the parking lot in a truck. It was the last eye-witness account of Chapman's whereabouts.

Chapman was last seen driving a 2010 Ford white crew cab pickup. The license plate number is OUM-214. He is described as having green eyes, 5-foot-6 inches tall and weighing 160 pounds.

If you have any information, call the Beatrice Police Department at (402) 223-4080 or the Cabool Police (417) 962-3993.