Sean Johnston jailed for stabbing teenager in Tallaght

This report is a localnews.ie summary based on public court reporting and records; sources are listed below.

Sean Johnston was sentenced to 12 years in prison, with the final four years suspended, for assault causing serious harm at the Central Criminal Court on 6 November 2023.

The attack took place at Tymon Lane in Tallaght on 2 January 2021, when the victim was 16. Johnston also received sentences for threats to kill another teenager; the court imposed concurrent sentences.

The judge described the attack as premeditated and said the victim had suffered 14 stab wounds. Johnston’s co-accused, who cannot be named for legal reasons, received an eight-year sentence with the final two-and-a-half years suspended.