GARDAI say they are seriously concerned about the safety of a criminal, who survived a gun attack in 2011 but has not been seen since Monday evening.
Father-of-one Philip O'Toole (32) has not made contact with his family since he telephoned them that night.
He said goodbye to his partner and child at their home in Thornhill View, Bray, on Monday and when he failed to return home they reported his disappearance to the gardai on Tuesday morning.
Officers are concerned that he may have fallen foul of a drug-trafficking gang.
Mr O'Toole, who has drugs-related convictions, had previously survived a gun attack at Enniskerry, Co Wicklow, in August 2011.
The 2011 attack was thought to have been linked to a "turf war" between two gangs. Mr O'Toole struggled with the gunman and was shot in the stomach but made a good recovery from his injuries.
Gardai said he was well known to them and had been questioned several times in the past.
He was described as 5ft 7in tall, with brown hair and of medium build. Gardai have asked anybody with information to contact them at 01 6665300 or on the confidential line, 1800 666111.