NAMPA, Idaho -

The Canyon County coroner says a southwest Idaho woman found dead in a cornfield died of blunt force trauma to the head.

Authorities made the announcement Tuesday following an autopsy on 36-year-old Selena Dawn Thomas.

Her body was found Thursday near Melba.

Officers began searching in the field after Thomas' boyfriend reportedly told officers he hit her in the head with a hammer then pushed her and caused her to hit her head on a dresser.

Court records say he told investigators he wrapped her body in a sheet, stuffed her into the trunk of her car and buried her in the corn field with the help of three other men.

Alfredo Martin Martinez is jailed on a parole violation but has not been charged in Thomas' death.