The woman allegedly at the centre of a 'love triangle' which saw a convicted Irish drugdealer killed in Alicante, southeastern Spain, is among four people arrested in connection with his death.
Carl Carr, 38, from Dublin, was reported missing in September, and his body later found in a shallow grave by a Costa Blanca motorway.
Mr Carr's flatmate Wayne Walsh, from Kilkenny, Ireland, appeared in court on Saturday on suspicion of killing him, and remain in jail.
Two women are also in custody, however it is not known who is said to have been involved in the romantic triangle-drama that allegedly sparked the attack on Mr Carr.
One of them, named only as a dual Irish-Spanish citizen Natalie, is being held on suspicion of concealment.
Another, a British citizen named as Millie is also being held on suspicion of concealment.
'Millie' (left) and 'Natalie' (centre) are handcuffed following their arrest
In the triangle: Wayne Walsh and his British partner Millie, are both in custody in connection with the killing, with Millie accused of concealment and illegal weapons possession
Mr Carr was first reported missing by his British girlfriend Danielle Coupe, however family and friends say the couple were not together at the time of his death.
Walsh on the other hand had recently ended his relationship with partner Millie, a British citizen and mother of his child, over an affair with Natalie.
Both women were seen being led into court on Saturday, and are still in prison.
One local said: 'He [Walsh] has a child with Millie and they were going to get married until he hooked up with the other woman.
'I've been told he was seeing both [Natalie and Millie] when Carl was killed.'
Carl Carr, 38, was last seen in September on a night out at the Cabo Roig resort near Torrevieja
Walsh had reportedly recently ended his relationship with partner Millie, a British citizen and mother of his child, over an affair with Natalie
Walsh, 31, was one of Mr Carr's flatmates at a residential estate in Torrevieja on the Costa Blanca.
Mr Carr had moved to Costa Blanca three years ago after completing an eight-year jail sentence.
Mr Carr's mother Marie has insisted her son's death had nothing to do with drugs and said he was killed over a suspected 'love triangle' involving one of the two women arrested.
The fourth man in custody is a Spaniard. The nationality of a fifth woman questioned by police, who remains under investigation but has been released on bail, has not been revealed.
Investigators are expected to reveal more details about the case in the coming days following the removal of the secrecy order.
Walsh, who recently organised an online fundraiser for the Irish Cancer Society, is thought to be at Fontcalent Prison near Alicante.
Mr Carr's on-off partner Ms Coupe appealed for information on hiswhereabouts in a social media appeal shortly after his disappearance on September 16 last year, saying: 'We are just praying for good news.'
Mr Carr was first reported missing by his British girlfriend Danielle Coupe, however family and friends say the couple were not together at the time of his death
Revealing he was last seen at a dance event called Ambiguous in the Costa Blanca resort of Cabo Roig near Torrevieja, she begged friends: 'Has anybody seen Carl? He's been missing since Saturday.
'Me, his family and friends are going out of our minds with worry.
'Anyone who was at Ambiguous can you message with the last time you saw him please.'
His body was found last week buried by the AP-7 motorway between Benijofar and Algorfa, a 20-minute drive north from where the Irishman was last seen.
He is believed to have been beaten to death in the apartment where he lived.
His heartbroken mum confirmed on Saturday police had told her her son was the man Spanish police had found dead as she insisted his killing had nothing to do with drugs and revealed it was down
