Bobby Messett was killed during the shooting at the Bray boxing club earlier this year. Trainer Pete Taylor and Ian Britton both received injuries during the attack.
The fatal shooting occurred in Co Wicklow in June.
A woman in her 20s has been arrested as part of the investigation into a fatal shooting in Co Wicklow in June.
The woman was arrested in the Dublin area yesterday evening and is currently being held at Dundrum Garda Station.
A man, who was also arrested on Thursday in connection with the shooting, is still being questioned at Bray Garda Station.
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