Detective McCabe, a father of five, was fatally shot during an armed robbery at the post office in Adare, Co Limerick, on June 7, 1996. He was killed while carrying out his duties alongside his colleague, Detective Ben O'Sullivan.
Among those honouring his memory was Tánaiste Simon Harris, who described him as a dedicated public servant who lost his life while protecting the community. A special Mass was also held at Holy Rosary Church in Limerick to mark the anniversary.
Speaking afterwards, his widow Ann McCabe reflected on the passing of three decades since her husband's death, saying the impact of loss never fades.
"It’s hard to believe it has been 30 years since Jerry was murdered," she said. "Grief is not just for now, it is forever. My life stood still on June 7."
The fatal attack occurred when a Provisional IRA gang targeted a postal delivery in Adare. Detective McCabe and Detective O'Sullivan were escorting a mail van when their unmarked Garda vehicle was rammed by a jeep. Moments later, gunmen opened fire, killing Detective McCabe and seriously injuring Detective O'Sullivan, who survived despite suffering multiple gunshot wounds. He died in 2022.
Four men were convicted of manslaughter in connection with the killing in 1999. Asked about those involved, Mrs McCabe said they no longer play any role in her life, adding that her family had fought difficult battles over the years but had persevered.
She also paid tribute to the support she has received from her family, friends, members of An Garda Síochána and victims' groups.
Remembering her husband, she described him as a peaceful man who loved his work and enjoyed bringing humour to those around him. She recalled that he had a sticker on his patrol car promoting peace on the day he was killed.
Chief Superintendent Derek Smart said Gardaí remain committed to pursuing all outstanding lines of inquiry and stressed that the investigation is still active.
"We remember Ben O'Sullivan who was also in the car that day," he said. "They were carrying out their lawful duties when they were so brutally shot down."
He appealed to anyone with information about the events of June 7, 1996, to contact Gardaí, saying investigators are still eager to speak with individuals who may be able to assist the inquiry.
Chief Superintendent Smart said he remains hopeful that advances in investigations and international cooperation will eventually provide further answers for both the McCabe and O'Sullivan families.
Also attending the commemoration was Kenny Donaldson, director of victims' organisation SEFF, who said the McCabe family is held in great respect due to its long tradition of public service. He noted that both Jerry McCabe's son and grandson followed him into An Garda Síochána.
Originally from Co Kerry, Detective McCabe worked as a mechanic before joining the Garda force in 1964. In recognition of his bravery and service, he was posthumously awarded the Scott Gold Medal in 2000.
