Evidence by Ms Collins, 25, helped convict Ger Dundon’s brother John last year for the murder of rugby player Shane Geoghegan.
April Collins had three children with Ger Dundon before entering a new relationship with notorious rapist Thomas O’Neill, with whom she now has a child.
The McCarthy-Dundon gang have ordered a “hit” on April Collins as revenge for giving evidence against John Dundon. She is also a key witness in the upcoming trial of McCarthy-Dundon leader Wayne Dundon, and close associate Nathan Killeen, who are charged with the murder of businessman Roy Collins.
Armed detectives took up positions outside April Collins’s home at Hyde Road at the weekend.
Gardaí were also keeping a close watch on a terrace of five houses about 500m away, near Colbert Railway Station at Hyde Road where two girlfriends of the jailed Dundon brothers live.
Gardaí believe Ger Dundon is likely to move into one of the Dundon residences on Hyde Road.
He has indicated that he wants to go back to England where he and his brothers were brought up by their Limerick-born parents, before they came to Limerick in their teens.
One of the women living in the Dundon Hyde Road enclave is Ciara Killeen who is a sister of Nathan Killeen.
April Collins has been under round-the-clock armed Garda protection since the trial of John Dundon. Yesterday armed detectives took up a more overt presence outside her home at Hyde Avenue.
Associates of Thomas O’Neill, now serving a sentence for violent robbery, have been moving in on the McCarthy-Dundon’s drugs patch while the Dundon brothers have been behind bars.
Gardaí said Ger Dundon had not arrived back in Limerick by late yesterday afternoon, although there had been unofficial reports of sightings. “If and when he does return to the city, his every move will be closely watched,” said a senior Garda source.
Additional armed gardaí have been deployed.