Julio Acevedo, the man wanted by New York police in connection with a hit-and-run car crash that killed a young Orthodox Jewish couple and their baby, gave himself in.
Acevedo, 44, handed himself in to New York City detectives in a car park in Bethlehem, Pennsylvania on Wednesday, ending a nationwide manhunt, New York City Deputy Police Commissioner Paul Browne said.
The meeting between the suspect and officers was arranged with the help of one of Acevedo's friends, Browne added.
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It comes after security was stepped up around the country following the Manchester Arena attack which killed 22 people.
The distress signal sparked a police hunt in the area to find the person or group who made it.
The seven-month-old baby girl is believed to have been left in a car in Co Tipperary for several hours.