Officers found Rondeau, his grandmother and her brother-in-law, Adolf Stegbauer, with stab wounds when they arrived at the northwest Indianapolis home shortly after 1 a.m. Thursday.
Rondeau was hospitalized in stable condition, while Adolf Stegbauer was in surgery with serious injuries.
Sgt. Matthew Mount says an autopsy will determine whether Stegbauer died from her stab wounds or a heart attack.
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