A re-examination of the body of Kathleen Savio revealed a 1-inch blunt-force laceration on the back of her head and numerous bruises and abrasions all over her body, CNN reported Thursday.
Noted forensic pathologist Michael Baden has concluded Savio's 2004 death was a homicide. Peterson has been jailed since his arrest in May.
At the time of Savio's death, she and Peterson were going through a bitter divorce.
Her body was ordered exhumed after Peterson's fourth wife, Stacy, went missing in October 2007.
Peterson has been identified as a suspect in Stacy Peterson's disappearance.