Yep, you already knew that it could only be Ben Willis back this time... but in I Still Know What You Did Last Summer, we find out a lot more about this freaky serial killer. He once lived in Tower Bay Island himself, with his two children Suzi Willis and a boy (it is unknown what the boy was called as Will Benson was just a cover name), and his wife Sarah Willis. Ben discovered that Sarah was having an affair with multiple men on the island by spying on her through a mirror in the ceiling of their room (the same mirror incidentally, that he spied at Julie through as Julie had the same room - 201 - as Sarah Willis once lived in. In the original screenplay, when Ben is chasing the three girls through the attic and Julie finds the mirror, Ben says to her "Amazing what you can see through a mirror - your wife sleeping with every man on the island... and you..."). Ben later killed his own wife for committing adultery, but only pieces of her body were discovered scattered about the island - this fact explains how Ben could possibly go after and slaughter teens without feeling any remorse.

There is, however, a second killer in I Still Know... His cover name is Will Benson (because, obviously, he is Ben's son) and he acted as Julie James' friend for some time before impersonating a radio broadcaster and letting Karla Wilson win a trip to Tower Bay Island so that his father could finish them off. Unfortunately (for dear old Ben), "Will" was hooked by his own father by accident at the climax of I Still Know... Hence the ending of the plotting William!