Mason O’Connell-Conway died in March.
A woman has been released without charge in relation to an investigation into the death of a 4-year-old boy in Limerick.
On March 13th, Mason O’Connell-Conway suffered serious head injuries at a house in Rathbane - but died in hospital a few days later.
Last month, a man in his 30s and a woman in her 20s were arrested on suspicion of murder, but were released without charge.
A woman in her 20s was arrested for a second time yesterday and has been released again without charge.
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