Aircraft N5241M
The FAA site claims the ship was destroyed and reg Cancelled 2000/08/03. It also lists the name of the owner for that period
http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=5241M
Thanks very much! I must have only looked at the top part of the FAA Registry and not scrolled down far enough.
Interestingly, the aircraft is listed as destroyed within about a month of when my dad passed away in 2000.