A Wisconsin man has admitted slashing his three daughters to death. Now, a jury will decide whether they believe his claim that he was insane when he did it.

Aaron Schaffhausen goes on trial Monday in St. Croix County, just east of Minneapolis. Schaffhausen last week admitted cutting the throats of his daughters — 11-year-old Amara, 8-year-old Sophie and 5-year-old Cecilia — last July in their River Falls home.

Prosecutors say Schaffhausen was bitter over his divorce from his ex-wife, Jessica, and angry because he thought she had begun seeing another man. A criminal complaint says he called his ex-wife the day the girls were slain and told her: “You can come home now because I killed the kids.”

Schaffhausen’s attorney says his client has a “major depressive order.”