A 22-year-old man today admitted murdering a teenager in a late-night stabbing incident in North Walsham. Troy Tkaczek is already serving a seven-year sentence for the attack on 19-year-old Sam Armstrong in August 2005 when two teenagers were hurt.

A 22-year-old man today admitted murdering a teenager in a late-night stabbing incident in North Walsham.

Troy Tkaczek is already serving a seven-year sentence for the attack on 19-year-old Sam Armstrong in August 2005 when two teenagers were hurt.

Today at Norwich Crown Court Tkaczek, whose address was given as Blundeston prison, pleaded guilty to the murder of Mr Armstrong on January 13 this year - the day on which he died, 17 months after being stabbed.

Tkaczek will be sentenced on January 18.

He was charged after a change in 1996 to the law that a murder charge could only be brought if an attack and subsequent death were separated by no more than a year and a day. Tkaczek's case is believed to be the first of its type in Norfolk.