Old Man Withers

The "Old Man" Withers, also known as the head assassin of ghoul-haters, was the leader of a raider group

Background
His raider group came to Springfield in order to eradicate its ghouls and overthrow the mayor Chris Avellone. He was a young man who was skilled in combat, using a shotgun against his enemies. The group he led, while it appeared to be just another raider gang, was a party of ghoul-haters who were annoyed by the mayor's pro-ghoul politics. The group was quite large and included not only regular members (called simply raiders in-game) but also some elite, experienced warriors called "enforcers."

Other interactions
The head assassin, as he presented himself during the attack, was found and killed by the Warrior along with all of his men.

Appearances
Head assassin Withers appears only in Fallout Tactics.