Man in critical condition after what Medford Police say was an apparent attempt at murder-suicide at a Rogue Valley Manor residence.

The former owner of a Southern Oregon grocery chain is in critical condition in a local hospital and his wife is dead in what Medford police call a murder and attempted suicide.

Rogue Valley Manor employees on nightly rounds checking residents found two stabbing victims, Raymond Nidiffer, 79, and his wife Mary June Nidiffer, 80, inside their locked apartment at about 11:15 p.m. Sunday. Workers called police and an ambulance.

The emergency crews determined Mary June was dead of knife wounds and Raymond had an apparently self-inflicted knife wound. He was transported to a local hospital by Mercy Flights ambulance, and was listed in critical condition this morning, Medford police Lt. Tim Doney said.

The investigation is ongoing. Police plan to serve a search warrant at the Nidiffers’ apartment today, Doney said.

Jackson County Medical Examiner’s Office and the Jackson County District Attorney’s Office are assisting Medford police detectives in the case.

Raymond Nidiffer built C&K Market Inc., of Brookings, into a regional chain of stores including his namesake Ray’s Food Place, Price Less Food, Shop Smart and Pharmacy Express. Ray’s son Doug Nidiffer now heads the company and his grandson, Alan Nidiffer, is also an officer in the company, C&K Market’s Web site said.