Parker is the only “counterfeit Cassidy” that is actually related to Butch Cassidy. Robert Parker Heap blew himself up while working for the Union Pacific at Sherman Hill. The family tree showing the relationship of Butch Cassidy (Robert Parker) and his first cousin, once removed, Robert Parker Heap. The case of mistaken identity happened after Robert Parker Heap blew him up and newspapers reported that it was Butch Cassidy. “Once and for all, we can clear out the way the possibility that the man blown up was Butch Cassidy,” Bell said.