She was the station's first ever political correspondent
Broadcaster TV3 says its political editor, Ursula Halligan, is to step down after nearly 19 years at the station.
Ms Halligan will leave TV3 at the end of August.
She reported on four general elections and covered the tenures of four different Taoisigh.
She was TV3's first ever political correspondent and is an award-winning journalist.
She also hosted her own political show, 'The Political Party', for nearly five years.
Ms Halligan stepped aside from covering the marriage equality referendum in 2015, after revealing she wanted to see a Yes vote.
Speaking about her sexuality, she said: "Before this referendum came along... I suppose I was resigned to going to my grave with that secret, and I shiver to think (that) there must have been so many people who've done that".
"Who have lived incomplete lives and gone to their graves, quietly, because they were too embarrassed or too ashamed to talk about it".
"The referendum forced me to confront the issue head on, I realised I couldn't sit on the fence - it was just too personal, it was my life", she added.
Mick McCaffrey, Head of 3News Ireland, said: "Ursula has made a valuable contribution to TV3 over the past 18 years and was always an independent voice in politics, going beyond the spin and hype to give our viewers the real story of what was happening at Leinster House.
"She was respected across all political parties for her insights and independence.
"We would like to thank Ursula for her dedicated service and wish her the very best for the future".
The announcement about Ms Halligan's departure comes just a week after Vincent Browne confirmed he is stepping down as presenter of the 'Tonight' programme from the end of July.