Ms Halappanavar had sought a pregnancy termination when told she was miscarrying, but the request was refused an emergency termination due to Ireland's then strict anti-abortion laws. She died of blood poisoning days after miscarrying in October 2012.
Ireland will decide by referendum on May 25 whether to repeal its constitution's eighth amendment, one of the most severe abortion bans in the developed world. Approved by 67 percent of Irish voters in 1983, the eighth amendment grants a mother and unborn child an equal right to life. Seeking or providing an abortion in Ireland is punishable by up to 14 years in prison. Now, polling suggests that a majority may vote to repeal. That would clear the way for lawmakers to debate proposed legislation allowing abortions within the first 12 weeks of pregnancy, and beyond that in cases of fetal abnormalities or serious risks to the mother's health.
Irish voters who favour liberalising abortion laws maintain a strong lead with eight days to go until a referendum, but the gap over those who oppose the change is narrowing, an opinion poll showed on Thursday.
It is the first opportunity in 35 years to overhaul one of the world's strictest regimes, which has long divided the once deeply Catholic nation.
When the same poll asked three weeks ago whether voters would support a change allowing the government to legislate for abortion on request up to 12 weeks - the regime it hopes to introduce after the vote - 47 percent were in favour and 28 percent against.
Support for change was strongest among younger voters, women and those living in urban voters.
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