A recently released prisoner is wanted in connection with the murder of a love rival who answered a midnight call at his home.
Jason Ryan was stabbed several times and later died when his attacker called at his front door in Hollyville Heights in Wexford late on Tuesday night.
Gardai believe the 27-year-old, originally from Ferndale in the town but living in the quiet estate with his partner, fell out on to the street after being knifed.
It is believed the altercation between the two men continued outside the house as Mr Ryan tried to fight off his attacker.
Senior detectives in the region said they are following a definite line of inquiry. It is understood Mr Ryan had been in a relationship with his attacker's ex-girlfriend.
The suspect was released early from a five year jail sentence for an assault in Wexford in 2007 in which a man was left in a coma. He is believed to be from the outskirts of Wexford town.
It is understood Mr Ryan, who had a number of convictions, had been living in rented accommodation in Hollyville with his girlfriend.
A Garda spokesman said he suffered several stab wounds in the attack and was taken to Wexford General Hospital in the early hours after Mr Ryan's partner called the ambulance. He died as a result of his injuries several hours later.
Gardai believe the row between the two men spilled out on to the street after Mr Ryan was initially stabbed in the doorway of the home.
A spokesman confirmed several crime scenes have been identified. Mr Ryan's home has been sealed off for forensic examinations and the Garda Technical Bureau and staff from the state pathologist's office were also called in.