KANSAS CITY, Mo. (AP) — A former house painter whose murder conviction in the 1993 central Missouri killing of his mother was overturned will be back in court as the state Attorney General appeals the case.

A hearing is scheduled for Thursday to consider Attorney General Chris Koster’s appeal of a judge’s decision to overturn the life sentence of 54-year-old Dale Helmig. He was sentenced iin 1996 for his mother Norma’s death three years earlier. Her body was found tied to a concrete block in a flood-swollen river in Osage County.

A judge in the northwest Missouri county ruled in November 2010 that prosecutors and law enforcement officers withheld evidence and presented false testimony at Helmig’s trial. He also said Helmig’s attorney was likely under the influence of drugs in court.

Copyright 2011 The Associated Press.