Jones Jr. told detectives that Casei Jones retrieved a baseball bat, which he took away from her. He began striking his wife repeatedly with the bat, killing her, the report said.
Jones Jr. has not given a motive for the killings, authorities said.
Jones Jr. was transported to Marion County from Georgia, where investigators said he was caught driving around with his wife's body in the car and then led deputies to bodies believed to be those of her four children.
Jones Jr. is facing a second-degree murder charge in the death of Casei Jones as investigators await the autopsy results for the four children.