A murder investigation is underway in the small town of Wagner. That's about 50 miles southwest of Mitchell. 47 year-old Michael Costello was killed and 42 year-old Tamara Bruguier was injured.  According to the South Dakota Attorney General's Office, the murder happened at the Dakota View Apartment Complex Sunday morning. DCI, Wagner Police, and the Charles Mix County Sheriff's Office have been on the scene throughout the day.  On Monday, they arrested 35 year-old Stephen Cournoyer III, from Marty, South Dakota.  He's charged with Murder in the 1st Degree, and Attempted Murder in the 1st Degree.  Cournoyer made his first court appearance this morning in Lake Andes. 

Law enforcement spent most of the day Sunday and Monday investigating Wagner's first possible homicide in several years. The murder weapon appears to be a baseball bat. According to court documents, video from security cameras from inside the building show Cournoyer III,  leaving the apartment at 8:15 Sunday morning with a bat. The bat is what officials believe Cournoyer used to kill Michael Costello and severely injure Tammy Bruguier, who remains in the hospital in a chemically-induced coma.

The entire situation has frightened Wagner residents. Kendra Rolston says, "It's kind of scary, because nothing like this normally happens. It's a small town and everybody usually knows everyone." But they are glad the man allegedly responsible is behind bars. Craig Krsnak says, "I'm glad they caught him and I hope they can prosecute him and that people see that, whether it be this community or any other community that you know. If you do the crime, hopefully you'll do the time."