The 19-year-old can not be named as he was a youth at the time of the killing in June of 2013.
Court was told 25-year-old Jaimie Black Rabbit was stabbed 124 times following an altercation between the accused and victim at a home on the reserve.
Court was told that after the killing, the accused bound Black Rabbit's feet with a string of Christmas lights and a belt and dragged him outside, covering him with a quilt and dirt.
The judge has agreed to sentence the teen as an adult when he returns to court in February.
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