Quite possibly not; “Kolchak” was a big inspiration for “The X-Files”, and Chris Carter tried for years to cast McGavin before eventually snagging him for two cameo appearances as a retired FBI agent.
I also thought he had died several years ago.
I can’t help but imagine that his coffin is a packing crate, marked “FRAGILE” and “THIS SIDE UP —>” on the side. Ralphie, go get me the crowbar!