DiMaggio, 40, died after he was shot six times, Valley County coroner Nathan Hess said.
Hess said the final autopsy report was not complete because the toxicology results had not come back -- he said he expected them "any day" -- but said the cause of death would not change.
The manner of death was listed as homicide, Hess said.
Hannah was rescued safely and returned to San Diego County.
The search for Hannah began Aug. 4, after firefighters found the bodies of the teenager's mother and brother at DiMaggio's burning home in eastern San Diego County. Investigators say DiMaggio killed Christina and
Christina Anderson, 44, was bound, gagged and beaten to death, an autopsy showed.
The body of 8-year-old Ethan Anderson was so badly burned that the medical examiner was not able to determine a cause of death, according to the report.