Woodhull, 41, was taken to a hospital, where she was pronounced dead.
MINNESOTA POLICE BODYCAM FOOTAGE SHOWS MOMENT KNIFE-WIELDING MAN WAS SHOT: VIDEO
Castillo, 40, was charged with second-degree murder. It wasn’t clear Friday if he has an attorney. Police haven't disclosed a possible motive for the attack.
A Minnesota man has been arrested after reportedly stabbing his wife to death during a Bible study session hosted by a relative. (Fox News)
Castillo's sister told officers that she hosts a Bible study for relatives at her home on Tuesdays. Woodhull and Castillo sat together on a couch, according to the charging document.
MINNESOTA TEEN DEAD IN SCHOOL STABBING, ANOTHER STUDENT ARRESTED: POLICE
During this week's session, Castillo held his wife's hand and kissed her, then whispered something to Woodhull. When she shook her head no, he pulled out a hunting knife and began stabbing her, the report says. Other relatives tackled Castillo and held him until police arrived.
Castillo has a long criminal history, including felony convictions for assault, according to court records. In one case, he attacked a woman with a hammer, and in another, he repeatedly stabbed a roommate, prosecutors say in the charging document.