British Anti-gun campaigner stabbed to death

This murder case is somewhat bizarre. First, an anti-gun campaigner is stabbed to death. Second, that the person who stabbed to death had been arrested earlier the same day for stabbing someone else. The BBC has the story here:

The grandson of prominent anti-gun campaigner Pat Regan has been arrested on suspicion of stabbing her to death.
Mrs Regan, 53, was discovered at the property on Marlborough Grange in the Hyde Park area of Leeds on Sunday.
The mother-of-six started campaigning against gun crime when her son Danny was shot dead in 2002.
The 20-year-old man was being held on suspicion of murder, police said. It is thought he had been arrested earlier in the day over another stabbing.
A 45-year-old railway worker was treated in hospital for a stab wound to his arm after challenging a man for trespassing at Leeds station on Sunday morning, British Transport Police said.

Thanks to JJ for sending me this link.