Bray boxing club was set up by Pete Taylor and is where world and Olympic champion Katie taylor trained.
Gardaí can confirm that a 30-year-old man has died following a shooting incident..
The shooting happened at about 6.55am on Tuesday at Bray Boxing Club in The Harbour area of the town.
Gardai are searching for a suspect who fled the scene in either a silver or a white van.More news: Long wait over for Goldolphin as Masar wins Derby
Irish police told the BBC that Taylor's injuries and the injuries of the 35-year-old man are serious, but not life-threatening.
They are trying to trace the movements of the silver coloured Volkswagen Caddy van with a Northern Irish registration which used in the shooting.
It is understood the father of three was shot as he answered the door of the gym, he was pronounced dead at the scene.
They are appealing for anyone with any information to contact them.More news: Grainy, icy 'dunes' found on Pluto
'The gym is council-owned and it is operated by Pete Taylor, who is Katie's dad'.
The club was where Taylor - Ireland's Olympic, European and World champion - began her career, before going on to win gold at London 2012.
The body of the man killed was removed from the boxing club at around 2pm and taken from the scene in a blacked out vehicle.
Local Sinn Fein TD John Brady tweeted: 'Absolutely shocking news coming from Bray Boxing club this morning.More news: Many With Early Breast Cancer May Not Need Chemo
Ireland's health minister Simon Harris, who represents the constituency of Wicklow, tweeted: "Shocking news in Bray this morning".