Kildale Un-named stone

Driving along the Kildale to Commondale road I noticed this fella standing on whats called by the OS, a cairn. It’s a single stone on a raised platform, more of a tumulus than a cairn, but who am I to argue with the OS.
I traipsed up to investigate, its only 2 minutes from the road.
The stone is been standing there a long time judging from the weathering on his top. He stands approx 1.6m X 0.6m.
It’s not a cross stone and doesn’t appear on the map as a boundary stone.
There is some graffitti on the stone which says ?“B died here”
Some party that must have been.