I lived in Chiswick at the time and have a friend who still lives in Gowan Avenue, Fulham, where Jill Dando lived and was murdered, so I know the area well - can't believe it's been 20 years.
A strange case indeed with all the hit-man conspiracy theories.
Had she been killed with a knife I would have put it down to 'opportunistic/wrong place wrong time' but the use of a gun, 20 years' ago, makes me lean towards her being personally targeted. Not necessarily a 'professional' hit-man, as it was broad daylight.