SAGINAW COUNTY -- A Saginaw County man is headed to trial on first-degree murder charges.

Saginaw County prosecutors say 25-year-old Mark Abraitis put a gun to his girlfriend's head and pulled the trigger, killing her on April 25th, 2011.

Forty-eight-year-old Francine Conversa-Redburn's body was found in a ditch in Swan Creek Township.

During a preliminary hearing Thursday, Saginaw County Sheriff's detectives explained how they gathered evidence against Abraitis.

Abraitis was eventually charged with ten felonies, including first-degree premeditated murder.

Investigators say Abraitis also left a suicide note with a childhood friend, in which he confessed to the killing.

No trial date has been set.