Matters, 40, was killed after a 30-hour standoff with police on a rural property outside Prince George in 2012.
Matters was a soldier for 15 years and served in the Bosnian conflict. He was being treated for post-traumatic stress disorder (PTSD) when he was killed.
Matters’s mother and sister will be presented with the Memorial Cross, which recognizes soldiers who died during active duty or as a result of their service, in Prince George on Wednesday morning.
Tracey Matters believes her brother’s death was directly related to his PTSD.
"My brother was a loving member of our family who was known for his intelligence, generosity, kindness and warmth. He was deployed to Bosnia, came home injured and suffered significantly with post-traumatic stress disorder,” she said.
"He became quite depressed. He completely withdrew from friends and many family members."
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The medal will be presented by Matters's best friend, Warrant Officer Ryan Seguin, who served with Matters in Bosnia.
He says the military has come a long way in terms of identifying and treating PTSD.
"I mean, are we at the best-case solution? I'm sure there's more that can be done, and more that will be done. Right now I do believe that they have made some improvements from Bosnia,” Seguin said.
"It's great that the military recognizes the injuries that Greg received. It's well-deserved of course."
B.C.’s Independent Investigations Office, which investigates police-involved deaths, cleared Prince George RCMP officers of any wrongdoing in Matters’s death.
A coroner’s inquest is set to begin in Prince George on Oct. 7.