A man has been arrested by police investigating the murder of a shop manager who was killed as he cashed up for the night, Scotland Yard said today.Jamie Simpson, 33, was stabbed to death at the Matalan store in Hackney, east London, on Saturday night.

A man has been arrested by police investigating the murder of a shop manager who was killed as he cashed up for the night, Scotland Yard said today.

Jamie Simpson, 33, was stabbed to death at the Matalan store in Hackney, east London, on Saturday night.

A 26-year-old man was arrested last night and is in custody at an east London police station, a Metropolitan Police spokesman said.