Boyfriend is arrested for stabbing to death Irish barwoman, 41, inside New York City pub in vicious attack that saw him turn the knives on himself

The boyfriend of an Irish bartender has been arrested after allegedly stabbing her in the neck on Saturday. 

Marcin Pieciak, 36, was arrested Monday and charged with second-degree murder, after allegedly knifing Sarah McNally, 41, at The Ceili House in Queens, New York City. 

A source at the time speculated to the New York Post that McNally's attacker was in a relationship with her, saying: 'She was just standing there talking, her boyfriend came in and he just walked right in and stabbed her.'

'Then he started trying to stab himself. Horrible. Just horrible.' 

Pieciak has also been charged with two counts of criminal possession of a weapon, as witnesses alleged that he turned the knife on himself in the attack. 

Police arrived at the Irish bar at 6:34pm on Saturday to find both McNally and another man with stab wounds to their necks. It was not immediately clear if this person was Pieciak. 

Cops were forced to taser the suspected slasher as he allegedly held a knife in each hand, and refused to comply with orders to drop the weapons.  

Both individuals were taken to NYC Health and Hospitals in Elmhurst in critical condition, where McNally died from her injuries. 

McNally, who is from Longford, Ireland, had reportedly been living in New York for a decade, and was living with her boyfriend at the time. 

Reports said the couple had no history of domestic violence, however the New York Daily News reported that Pieciak had previously been arrested for domestic violence.

No motive has been released for the horror stabbing. 

An NYPD spokesperson told Fox News that Pieciak had no prior history of arrests in New York City.

Mike Lambe, a 62-year-old who lives in the neighborhood told The Post McNally was a 'sweet, innocent girl from Longford' who had worked at the bar for less than a year.

McNally's mother Dorrie O'Connor told the Irish Mirror from her home in Longford: 'My daughter was murdered. There is nothing else to say.' 

A common attendant at the Queens watering hole, Mike Green, told NY Daily News that he knew the couple well, and he 'still can't believe it.'

'They was (sic) always together,' he said, referring to the alleged killer 'M' as 'cool.' 

'Both of them. That’s why it blew my mind a little bit... Sarah is good people. She helps people. Everybody owes her money.'  

Longford Municipal District Cathaoirleach Cllr Martin Monahan told the Irish Independent: 'The people of Longford will be saddened and shocked by the sudden demise of a young life, someone who has made a life for herself in New York.'

'For such a young life to be so tragically ended in such violent circumstances, our thoughts and prayers go out to the people in the Queens area of New York that new her and her mother and father in Longford as well as her extended family.'