According to The Law of The Noble someone can be found guilty post mortem having an impact on his Family, Clan and House thereby Title and Position, but I can't tell if that is still in effect next to The Law of Common under House of Hanover rule.
Even so, Al Fayed was no Noble, having had no relevant inheritable title, his connections and relation to the main Aristocracy does demand, in my humble opinion, such investigation and trial, instead of making headline wordings for a news paper by a servant of justice.
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