Man arrested over fatal shooting of Mark Cullen in Dún Laoghaire

A man in his 30s has been detained in Dublin in connection with the July shooting death of Mark Cullen in Dún Laoghaire. Gardaí say investigations remain ongoing.

Arrest made in Mark Cullen shooting investigation

A man in his 30s has been arrested in connection with the fatal shooting of Mark Cullen in Dún Laoghaire, Dublin Live reports.

Mark Cullen, aged 39, was shot in the leg at Patrician Park, Kill Avenue, Dún Laoghaire on Sunday 5 July 2026 and subsequently died from his injuries. The arrest was made on Tuesday 13 October 2026.

The suspect is being held at a Garda station in the Co. Dublin area under Section 50 of the Criminal Justice Act, 2007.

"Gardaí continue to investigate the fatal shooting incident which occurred in Patrician Park, Kill Avenue, Dún Laoghaire, Co. Dublin on Sunday 5 July 2026," a Garda spokesperson said. "A male (aged in his 30's) has been arrested in connection with this investigation today, Tuesday 13th October 2026."

Gardaí are appealing for information from road users who may have been travelling near Kill Avenue between 8:00am and 9:00am on the morning of the shooting. Those with dashcam or other camera footage from that period are asked to make it available to investigating Gardaí.

Anyone with information can contact Dún Laoghaire Garda Station on 01 666 5000, the Garda Confidential Line on 1800 666 111, or any Garda station.

Source: Dublin Live