However, Dublin South-West's long-serving Labour Party TD Seán Dunne, who had been re-elected at the general election, died only seven days after polling.
Sherwin was selected as the Fianna Fáil candidate at the by-election on 4 March 1970, and won, taking his seat in the 19th Dáil.
[2] He resigned from Fianna Fáil in 1971 in the wake of the Arms Crisis, and joined Kevin Boland's new party Aontacht Éireann.
[3] The new party failed to take off at the 1973 general election, and Sherwin lost his seat to Fine Gael's Declan Costello.
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