Whilst I am no legal eagle, reading the ANO clause 73 states that no one should act in such a way to endanger safety of an aircraft, but 74 states that no one should permit an aircraft to endanger life or property.
So whilst the deceased might be considered (depending of course on what actually happened) to have contravened 73, the pilot has certainly contravened 74. Whether he could have actually done anything will depend on the circumstances.
Talk of hijack is poppycock since it does't appear in the ANO and I would have thought hijack implies taking over an aircraft/vehicle/vessel to actually use it unlawfully, not merely to stop it.