INDEPENDENCE (AP) - A prosecutor expects a Coralville woman accused of killing one of her sons and trying to kill another will use a defense of postpartum depression or postpartum psychosis.

Michelle Kehoe is charged with first-degree murder, attempted murder and child endangerment. She's accused of killing her 2-year-old son, Seth, and injuring her 7-year-old son, Sean, on Oct. 26 in a remote area near Littleton in northeast Iowa.

Kehoe's attorney hasn't been identified. Buchanan County Attorney Allan Vander Hart says he expects the defense will say Kehoe was suffering from postpartum depression or psychosis when she allegedly harmed her children.

Kehoe, who was also injured, remains at University Hospitals in Iowa City. She is expected to be taken into custody after she leaves the hospital.