The arrest was made after the woman was fatally injured in a Dublin apartment on Wednesday morning.
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BBC News Europe
Ukraine fury as Russia gets human rights vote
The Ukrainian delegation walks out of the Council of Europe assembly following the decision.
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Ukraine fury as Russia gets human rights vote
The Ukrainian delegation walks out of the Council of Europe assembly following the decision.
France's Mirazur crowned 'world's best restaurant'
It won the World's 50 Best Restaurants competition, but some experts question the methodology.
French state blamed in key air pollution case
A court rules the state failed to act to curb air pollution in Paris, in a landmark decision.
In pictures: Europe seeks relief from the heat
Temperatures are soaring across the continent, thanks to a plume of hot air from the Sahara.
Police under fire over man missing at French party
When police broke up a Nantes music party, 14 people fell in the River Loire and one has disappeared.
Facebook to name French hate speech suspects
The deal between the French government and the tech giant is believed to be the first of its kind.
Klitschko rescued from burning yacht
Former heavyweight champion Wladimir Klitschko is rescued by Spanish coastguard after the luxury yacht he was onboard caught fire.
Featured Contents
Ukraine fury as Russia gets human rights vote
The Ukrainian delegation walks out of the Council of Europe assembly following the decision.
France's Mirazur crowned 'world's best restaurant'
It won the World's 50 Best Restaurants competition, but some experts question the methodology.
French state blamed in key air pollution case
A court rules the state failed to act to curb air pollution in Paris, in a landmark decision.
In pictures: Europe seeks relief from the heat
Temperatures are soaring across the continent, thanks to a plume of hot air from the Sahara.
Police under fire over man missing at French party
When police broke up a Nantes music party, 14 people fell in the River Loire and one has disappeared.
Facebook to name French hate speech suspects
The deal between the French government and the tech giant is believed to be the first of its kind.
Klitschko rescued from burning yacht
Former heavyweight champion Wladimir Klitschko is rescued by Spanish coastguard after the luxury yacht he was onboard caught fire.
France's Mirazur crowned 'world's best restaurant'
It won the World's 50 Best Restaurants competition, but some experts question the methodology.
French state blamed in key air pollution case
A court rules the state failed to act to curb air pollution in Paris, in a landmark decision.
In pictures: Europe seeks relief from the heat
Temperatures are soaring across the continent, thanks to a plume of hot air from the Sahara.
Features & Analysis
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Temperatures are soaring across the continent, thanks to a plume of hot air from the Sahara.
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Irish finance minister Paschal Donoghue made his remarks as he outlined the summer economic statement.
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