SANGER, Texas — Investigators have identified the man they say stabbed his grandparents to death before killing himself in the home where all three lived in rural Denton County.

A Denton County Sheriff’s Office spokesman said investigators believe 26-year-old Ryan D. McGraw stabbed 71-year-old Douglas P. Greeney and 66-year-old Gladys Greeney to death before killing himself.

Sgt. Orlando Hinojosa (ee-noh-HOH’-sah) said no motive for the late Saturday stabbings has been determined.

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