ST. LOUIS COUNTY, Mo. – A homicide investigation is underway after a man was shot and killed Monday afternoon in north St. Louis County. John Cowan, 63, is being charged with murder and armed criminal action. He is being held on a one million dollar bond. Michael Mayer, 51, has been identified as the victim.

Officers responded to the 1200 block of Congress Avenue around 2:30 p.m. Wednesday in response to a shooting call. When they arrived, they found Mayer suffering a gunshot wound and was pronounced dead at the scene.

A witness tells police that the men got into an argument in the home. Cowan was armed with a shotgun when he went into the kitchen and allegedly shot Mayer in the stomach.

Police found the shotgun in the living room of the home. The victim’s body was found on the kitchen floor.

St. Louis County Police Department’s Crimes Against Persons detectives are handling the investigation. If you have any additional information on what led up to the shooting, contact St. Louis County police at 636-529-8210 or CrimeStoppers at 1-866-371-TIPS (8477).