CALGARY—RCMP say the man fatally shot near the U.S.-Canada border on Thursday was wanted for the murder of 18-year-old Brando Walker on an Alberta reserve.

Mounties say they were in the process of obtaining a first-degree murder warrant for 20-year-old Jamison Childress when he was killed by a U.S. Border Patrol agent near the Sumas, Washington, crossing.

Three other individuals, including a 15-year-old male, have been charged in connection with Walker’s death to date.

Walker’s partially burned body was found on the Tsuu T’ina Nation reserve near Calgary on March 7, although RCMP say he was killed in a Calgary home.

U.S. authorities said Childress triggered a border sensor Thursday afternoon and behaved erratically when agents responded.

They said he was shot by an killed by an agent after he sprayed the official with an unknown chemical.

Childress is originally from Prince George, B.C. and has faced several charges in the province including theft, mischief and assault.