Honestly, these two John Roberts guys are driving me crazy. There are so many death records for the older John between 1861 (last census he was in) and 1865 (where he's listed as "deceased" on young John's marriage cert), in Oswestry, Shrewsbury and Easington, Durham.
I suppose it would be reasonable to assume that he died in Easington as that's where his widow was in 1871 - it's more likely she'd stay there rather than moving to a place she had no other connection with after his death, right?
I just hate having to guess!