Detective Inspector Vicky Short, who led the investigation, said:
The physical and mental abuse meted out by the Rooke family on a highly vulnerable man plumed the depths of depravity.
David, Donna and Jamie Rooke abused Mr Kinsella for their own pleasure until his spirit and will to stand up for himself and fight back was crushed.
It has hard to understand how any human being could treat an individual in such a grotesque, callous and inhuman manner.
I am confident that if we had not received that phone call that day last July we would have been investigating a murder.”
More top news
Follow the latest results from the 13 Calendar region councils involved in the 2016 elections.
A schoolboy from Lincolnshire has been hailed a hero for saving a hedgehog from being kicked to death by another pupil.
England batsman Joe Root has signed a contract extension with Yorkshire which will keep him at Headingley until at least December 2019.