4 people found slain in SUV in Wisconsin cornfield: "Everybody's a suspect"

Four people found slain in an abandoned SUV in a western Wisconsin cornfield over the weekend had been shot and were all from Minnesota, authorities said of a case they described as a mystery. Preliminary results of autopsies performed Monday by the Ramsey County Medical Examiner's Office showed the two men and two women all died of gunshot wounds, the Dunn County Sheriff's Office said.

The victims were identified as Matthew Isiah Pettus, 26, Loyace Foremann III, 35, and Jasmine Christine Sturm, 30, all from St. Paul; as well as Nitosha Lee Flug-Presley, 30, of Stillwater. Pettus and Sturm were brother and sister, authorities said.

"I'm numb. I feel empty," Damone Presley, the father of Nitosha Flug-Presley, told CBS Minnesota.