an Undead slaying sniper (Guns / Archers / crossbowmen / Thrower / Hurler / Arcane) Prestige class

[Gurby]

ok, I think it's called "Death Stalker or Rest Giver" .

I played with a kid that was using it. I thought it was over Kill at the time because it had Archetype like mods for the type of sniper the character is.
The kid left for College and isn't answering his mail to his old box. I thought it was from web site. But the GM of the Campaign says its pdf of a 3pp book as he remembers.

Anyone have any ideas where to find it?

Any help would be great!! THANK!!!