Speedboat killer Jack Shepherd is back behind bars - after allegedly assaulting a new partner who complained about his 'coercive and controlling behaviour and assault', it is understood.

Jack Shepherd, 37, was initially sentenced to six years in prison after killing his 24-year-old date Charlotte Brown in December 2015.

Speedboat killer Jack Shepherd is back behind bars - after allegedly assaulting a new partner who complained about his 'coercive and controlling behaviour and assault', it is…