Schoolboy James Killen, 18, was held by police after next-door neighbour Jonathan London, 46, died of stab wounds.
It is believed Mr London attacked the teenager’s mother, former air stewardess Sandra Crawford, at her home in St Alban’s, Herts on Friday.
Mr Killen was arrested on suspicion of stabbing to death Mr London but later released on bail.
It is believed the teenager, a student at nearby Sandringham School, attacked Mr London after he discovered him slashing his mother.
The kid should have called the police and stood by watching his mother get slashed to death until the cops finally arrived. That way he wouldn’t be sitting in jail. See making self defense illegal is perfectly logical.