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The female in her 40s was being questioned over the murder of Gareth Hutch.
She is to appear in court tomorrow morning at 10.30am charged in connection with the investigation.
The 35-year-old victim was shot dead last Tuesday morning outside the flat complex where he lived on North Cumberland Street in Dublin's north inner city.
The Garda Commissioner's statement comes after Deputy McGuinness - a former chair of the Public Accounts Committee - revealed that Martin Callinan had told him that whistleblower Maurice McCabe was 'not to be trusted'.
In the Dáil last week McGuinness claimed that he was asked by Martin Callinan to meet him in a Dublin car park in 2014.
This was around the time McCabe attended a hearing at the PAC.
The infants are said to have died in separate cases on Wednesday and Sunday last week
In a statement, the RCSI Hospitals Group confirmed that two investigations have commenced directly in regard to Cavan General Hospital, however, it is not the policy of the hospital to comment on individual cases.
Last year a review carried out at Cavan General following a spate of infant deaths found a lack of consultants at the Maternity Unit.
It recommends wage increases of 15.6% to 18.3% at the company between now and September 2020.
The Labour Court also said there shouldn't be a half hour increase to the working day for drivers, saying it had health and safety implications.
The ruling also recommends a review on pay and conditions to compare the situation of Luas drivers to those of other light rail drivers across Europe.
Harry, the 'silverback', was the leader of the gorilla troop at the zoo. He was 29-years-old and the father of six offspring.
He died on Sunday May 29th after a short illness.
Staff at the zoo said the exact reason for Harry's death is still unknown and they are awaiting the final results of a post-mortem.