Nicholas Lush, who was 32, was last seen leaving a house party in Calgary on March 29.
Police say a witness saw two men beating a third man outside of a vehicle that was parked on Highway 1 near Cochrane, Alta.
Two men were later arrested in Cranbrook, B.C.
Cody Bauer, who is 24, of Calgary and 22-year-old Kristopher Goerzen of Brooks, Alta., have been charged with first-degree murder.
On Monday, Mounties conducted searches in the Longview area where the K-9 unit found human remains.
They say the medical examiner determined Wednesday afternoon that the remains are that of Lush.
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