There is no statute of limitations in the US for capital murder. Now, if means, motive and oppourtunity exist, the only thing needed is a body. The one in question is located near a Pittburg pyramid.
Permission to exhume a body can be obtained by: Presentation of facts to the county attorney... if the facts add up to some criminal intent to murder said body the office will order an exhumation and accept any new found evidence.
Or, the desceased's next of kin can request an exhumation by filing what ever paper work the state requires. Who is Russells nearest living relative? Maybe some family rumors may tie the "foul play" angle to enough weight to justify an exhumation and modern autopsy or CTR's remains.
I don't recall any "foul-play" mentioned in any of the documents I have ever seen regarding Russell's demise. Russell did pass on in Texas, is that where the death certificate was issued? That would be a good place to start. The Texas county coroner may order a exhumation order to look at evidence missed in 1914. But again, he would have to have a compelling story that ties the death to a crime commited in Texas.
And yes, with all the cable channels and general awareness of WTBTS in the states, this story is a natural for a cable network "who-dunnit" show. Most of the ones I see are about people much more obscure than C T Russell and Joe R. Just my .02.
---------Hill