The fastest way of finding him is opening the south gate to the caverns (Very Hard locked), then soon after a bend to the left his corpse is lying near a ground lantern. The alternative is going through the damp cave, sunken chambers and then entering the caverns.
The Branchtender's background is not known, except that he was killed by Mirelurks.
Interactions with the player character
|This character has no special interactions.|
There is no character in Oasis who mentions the dead Branchtender.
The dead branchtender appears only in Fallout 3.