Ben (O'Keefe's cousin)

Ben was the cousin of evil Sunnydale High student O'Keefe. At one point, O'Keefe implied that he was a murderer-he claimed that a booby trap he had set up to kill anyone who walked in on the ritual (he was trying to sacrifice Cassie Newton to the demon Avilias at the time) was something his "cousin Ben always used to do". This line implies that Ben was a murderer, and that O'Keefe knew about his murders, but kept quiet about it.

After Avilias was killed by Buffy, Cassie was nearly killed by Ben's crossbow booby trap that was set up by O'Keefe, but Buffy rescued her by catching the arrow before it hit her, though Cassie later died of a heart attack because of this anyway.