He was elected to the Dublin South constituency for Fine Gael in the 2011 election, but later lost the party whip over a vote on the Protection of Life During Pregnancy bill.
Politicians from across the political spectrum have been paying tribute this morning.
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Senator Jerry Buttimer tweeted to say Peter was 'a very sincere & genuine person', while Sinn Fein Senator Padraig MacLochlainn has 'described him as a thoroughly decent man who cared deeply' about the country.
