The move by the DPP, confirmed by a senior Garda source, is another major blow to Limerick’s most feared gang.
It is expected that both men, who are in custody, will be brought before the non-jury special criminal court.
The decision to press murder charges is the most significant development in the fight against serious gang crime in Limerick since the feud erupted in Nov 2000 with the murder of gang leader Eddie Ryan in the Moose Bar. So far, the feud has claimed 18 lives.
Gunman James Dillon was jailed for life for the murder of Mr Collins. However, others ordered and planned the murder. Mr Collins, aged 34, was shot dead in his family’s amusement arcade at Roxboro shopping centre on Apr 9, 2009.
Mr Collins’ father Stephen and other members of his family sold their pub business in the city last year and moved abroad due to threats on their lives.
Dillon, aged 27, pleaded guilty to the murder at the start of his trial at the Central Criminal Court in May 2010. He was jailed for life.
When Dillon was sentenced, the court was told the motive for the murder of Mr Collins went back to 2004, when a member of the McCarthy-Dundon family was refused entry to one of the pubs owned by Stephen Collins, as she was underage. Wayne Dundon was later convicted of threatening to kill the family member who refused his sister entry.