Philip Grandine was a pastor at the time of his wife's death, just over three years ago.
Paramedics were called to the couple's home in October 2011, for a call regarding a woman in medical distress. She was pronounced dead in hospital.
Her husband was arrested more than six months after she died. He was charged with first-degree murder.
During the trial, prosecutors had alleged that Philip Grandine, who was 25 at the time, drugged and drowned Karissa Grandine so he could continue a relationship with another woman — one of his parishioners.
Karissa Grandine was 29 when she died, and five months pregnant.
During the trial's closing arguments this week, Philip Grandine's lawyer suggested his wife might have killed herself or died accidentally.
More to come.