Police Say Main Suspect in Mark Cullen Murder Remains at Large After Alleged Accomplice’s Arrest

United Kingdom — July 2026

Police say the investigation into the murder of Mark Cullen remains active, with the primary suspect still at large despite the recent arrest of an alleged accomplice.

According to investigators, officers have taken one individual into custody on suspicion of assisting or being involved in the case. Authorities allege the arrested person played a supporting role in the events surrounding Cullen’s death. As with all criminal proceedings, the allegations have not been proven in court, and the suspect is presumed innocent unless and until proven guilty.

Detectives emphasized that the individual they believe to be principally responsible for the killing has not yet been located. Police are continuing extensive efforts to identify and apprehend the outstanding suspect.

The investigation includes the review of forensic evidence, surveillance footage, digital records, and witness statements as officers work to establish a complete timeline of the homicide.

Law enforcement has appealed to the public for information on the whereabouts of the wanted suspect, urging anyone with relevant knowledge not to approach the individual but to contact police immediately.

Family members of Mark Cullen continue to seek answers as the investigation progresses, while authorities reaffirm their commitment to bringing everyone allegedly involved in the case before the courts.

Police say the inquiry remains ongoing, and further updates will be provided as investigators gather additional evidence and continue the search for the outstanding suspect.

Source: Irish Independent