You know, I am a Bears fan, and it was sad enough to start with that our greatest ever coach had met an untimely end; to have been murdered makes it even sadder, but, bugger me, the murderer must have had hands like bloody shovels.....have you seen the size of Woolmers neck?
Did Woolmer make any decisions in the game that were dodgy? All the reports I'd read suggested that Ireland (that is, a few Irish, a few Aussies and at least one South African) just had a good day: if anything, they suggested that one umpire gave a few dubious decisions against Ireland, particularly the non-catch dismissal of Botha. In any case, coaches generally don't have that much input during actual matches, even one-dayers: tactical decisions are for the captain. And all the best-known match-fixing scandals involved players. So, to answer your question: I can't think of any situation (given the ordinary division of duties between coach and captain) where a coach could make a deliberate decision to affect a match.