OBD - Yep, spot on .. Ray Whitbread was doing aerobatics in VH-IVI (A68-119), near Windsor, on 11th June 1973, when the canopy detached, flew off, hit the tail, and the aircraft dived into the ground, killing Whitbread on impact.
Here's the definitive Mustang list of ADF S/No's, showing all the CAC CA-17/CA-18, and Nth American P51D/P51K known histories ..
http://www.adf-serials.com/2a68.shtml