WAUSAU, Wis. (AP) – A 32-year-old Marshfield man won’t go back to prison for killing his girlfriend after reaching a new plea deal.
 Eric Mayer pleaded no contest Monday to felony murder.   Mayer already served 585 days behind bars for the March 2009 death of 43-year-old Cynthia Tyler. He was sentenced Monday to time served.  Mayer admitted he slapped Tyler after an argument in the couple’s home. Tyler died the next day of a ruptured artery in her brain.  Mayer initially was sentenced to 10 years in prison but won a bid for a new trial. Daily Herald Media reports the plea deal was arranged after prosecutors discovered that part of Tyler’s body was lost during an autopsy.  WSAW-TV reports Mayer was also sentenced to six years and five months on extended supervision.