O’Driscoll, the former chief of staff of the Real IRA, and a father of two, was gunned down at point-blank range in Blackpool last December, sending shockwaves through the local community.
Gardaí are awaiting a decision from the Director of Public Prosecutions (DPP) on six individual files sent following local arrests earlier this year, Superintendent Mick Comyns has confirmed.
The files, which contain information on six people who were arrested during the investigation, are hoped to lead to further arrests.
Supt Comyns also told the Evening Echo that he was very happy with how the investigation was going and he eagerly awaited a response from the DPP.
“We are awaiting direction from the DPP and we expect more arrests to follow,” Supt Comyns said.
O’Driscoll, who had been due to marry his fiancée in January 2017, died of multiple gunshot wounds after being gunned down around 5pm on December 7, 2016, on Old Commons Road.
Mr O’Driscoll had lived for periods in Limerick and Dublin.