A man travelling with his grandson in a vehicle through Kootenay National Park passed away Friday morning after suffering a heart attack on the highway near Numa Falls.

Upon his grandfather entering cardiac arrest, the grandson pulled over and attempted to give the man CPR to revive him but to no avail, said Cpl. Grant Simpson of the Columbia Valley RCMP detachment.

Cpl. Simpson said the man is believed to have been in his 60s and was not from the Columbia Valley.

The Pioneer will follow up when the RCMP investigation releases more details.