Two men and two women are arrested over death of mother-of-four who was shot dead on her doorstep in case of 'mistaken identity'
Joanne Penney, 40, was staying at a flat used as a drugs den when a gunman shot her on the doorstep.
Joanne Penney, 40, was staying at a flat used as a drugs den when a gunman shot her on the doorstep.
