(AP) — Authorities say a Creighton University professor found dead in his Omaha home last month was shot, and his wife was stabbed to death.

The Douglas County coroner reported Friday that 65-year-old Roger Brumback died of a gunshot wound, and his wife, 65-year-old Mary Brumback, died of stab wounds. Their bodies were discovered May 14.

Omaha police have been trying to determine if the killings are related to another double-homicide five years ago. Eleven-year-old Thomas Hunter and his family’s housekeeper, Shirlee Sherman, were found dead inside the Hunter home in March 2008. The case remains unsolved.

Both sets of murders have a connection to the Creighton Pathology Department, where Thomas’ father was a colleague of Roger Brumback.