erin,
Never mind when Benwell became part of the City of Newcastle upon Tyne, it was included in the Newcastle Registration District ( as Diddy says), from the start of BMD registration in July 1837.
Benwell was one of the "townships" of the Parish of St John, west side of Newcastle.
The Parish cemetery was/is off Elswick Road.
To stand a good chance of finding where he is buried, his death registration is needed.
The John Kelly death Diddy found was 56 yrs at death.
What info do you have to point to a death around 1892, in Benwell ?
Michael Dixon