A southwestern Idaho man has pleaded guilty to killing his wife by causing a car to fall on her while she changed the oil.

The Idaho Statesman reports 38-year-old Rodney Wayne Bibbey initially told police that his wife had been changing the oil on her car when the jack slipped. An investigation determined the April 2012 death of 35-year-old Trina Bibbey was a homicide.

Rodney Bibbey of Marsing pleaded guilty to second-degree murder on Oct. 21 in a plea agreement that reduced the first-degree murder charge.

Bibbey is scheduled to be sentenced Dec. 23 on that case and for an injury to a child conviction that was initially charged as sexual abuse of a child under 16.