Councillor Tina MacVeigh will be "temporarily" stepping down from her duties on the local authority.
Lord Mayor Alison Gilliland made the announced at the full meeting of Dublin City Councillors.
The People Before Profit Councillor is stepping away from her duties due to a family member's medical condition.
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She said: "A member of my immediate family has been in and out of a health crisis and the situation has worsened."
The attention Cllr MacVeigh's family members needs means she cannot give the "level of commitment and integrity" her duties deserve.
She will be stepping down until the end of the year and the PBP will co-opt a replacement in the June Council meeting.
Cllr MacVeigh is the Chair of the National Homeless and Housing Coalition which includes more than 50 organisations actively campaigning on the housing crisis. She also campaigns on Palestine and on women’s rights.
As a Councillor, Tina has been central to the Bridgefoot Street Park campaign and is now heavily involved in Reclaim the Iveagh Markets.
Bridgefoot Street Park was recently opened to the public.
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