Bill Libby.
Only one who was TOTALLY ALONE that night. (wife out of town)
Only one who was supposed to HAVE A DATE with Brenda, but (as far as we know) never showed up at Dad's.
Only one whose TIME that FRI/SAT has never been accounted for.
One who then 'managed' the DONATIONS to the Danielle Recovery Center.
One who had a cabin in the mountains that He/his son and Damon/his sons were supposed to go to for a FATHER/DAUGHTER snowboarding event. (if that makes any sense)