This boss is in Seaside Drive-in. You have to take the rations in the cabinet to the Chef's right and then he will attack you. Needless to say at level 62 he is unfathomably strong, but he is susceptible to instant death. A pestigenocide weapon would be ideal, but anything with instant death will work. Save your game beforehand of course, and then use the Doggy Style skill to stun him, then pray instant death hits before the stun wears off and he instantly one-shots your party. The chance is decently low but not too terrible, took 6 shots over 2 save reloads to kill him. With an instant death weapon and Doggy Style you can do this very early, I did it at level 13. Instant skills are used before the round starts, so even though he's much faster than you, you can stun him and kill him.