Tadhg Costello, of Richmond Hill, Monkstown, arriving at court, where he changed his plea to guilty. Photograph: Collins Courts.

A teenager accused of attempting to murder a 17-year-old has changed his plea to guilty during his Central Criminal Court trial.Tadhg Costello (18) of(...)

Tadhg Costello, of Richmond Hill, Monkstown, arriving at court, where he changed his plea to guilty. Photograph: Collins Courts.

A teenager accused of attempting to murder a 17-year-old has changed his plea to guilty during his Central Criminal Court trial.Tadhg Costello (18) of(...)