A man has been jailed for 40 years for killing his ex-girlfriend and her nine-year-old son at their home before attempting to stab an off-duty cop who tried to arrest him.
Daniel Boulton was found guilty of the murders of Bethany Vincent, 26, and her son Darren Henson, who were found dead in Louth, Lincolnshire last May.
Ms Vincent suffered nine stab wounds, one of which was 20cm in depth and passed through her heart.
