Stephen Carl Allwine was found guilty Wednesday night of fatally shooting his wife and staging her death as a suicide.
Following six days of testimony that ended Tuesday, the Washington County jury deliberated for about eight hours after getting the case earlier Wednesday.
Amy Louise Allwine, 43, who was shot once in her right ear, was found dead on the floor of her bedroom in her Cottage Grove home in November 2016.
Stephen Allwine was charged with second-degree murder before a grand jury indicted him with first-degree premeditated murder in March 2017.
The penalty for a first-degree murder conviction is mandatory life in prison. Formal sentencing will take place Friday morning.
After the verdict, Amy Allwine's parents and siblings said in a statement: "We can summon no words to describe life without Amy. We loved her and miss her tremendously. We now turn to the path ahead of privately healing and grieving."
Prosecutor Fred Fink, in his closing argument, said evidence showed that Amy Allwine had been drugged with a life-threatening dose of scopolamine before she was shot with a 9-millimeter handgun in a hallway.
Stephen Allwine moved her body to the bedroom where he tried to disguise her murder as a suicide, Fink said.