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Also from your link -
Tyner case remains cold - Merritt Herald
“Our Wyoming Senator, Mike Enzi, has been very helpful in getting the FBI and State Department involved in assisting the RCMP.” ...”
I’m not exactly sure what the above refers to as the FBI and Wyoming State Dept have absolutely no jurisdiction to conduct investigations within Canada, regardless that Ben was a US citizen. But it’s possible the RCMP could be looking a potential US suspect who crossed the border and back, somehow involved directly or indirectly because that’s one reason for this type of cross-border liaison taking place.
I really do hope the family will be given answers very soon. I can only imagine the heartbreak, the emptiness, the unanswered questions which they were suddenly confronted with.