By Michael McHugh
A three-year-old boy with suspected autism suffered fatal head injuries in a complete breach of trust by his killer, a lawyer told a court.
Kayden McGuinness sustained 15 bruises on the scalp and died from swelling and bleeding of the brain.
He was found dead in bed at his family flat in Derry - Londonderry in September 2017.
Liam Whoriskey, 25, from Glenabbey Gardens in the city, was convicted of manslaughter and cruelty to a child by a jury at the city's crown court in October.
He was a former partner of the child's mother.
Prosecutor Peter Irvine QC said: "There was a complete breach of trust in this case."
The child died from blunt force trauma, and probation officers said Whoriskey, posed a significant risk to other members of the public.
His former partner said he was aggressive and violent.
She said: "He went from 0-60, roaring and shouting."
A pre-sentence hearing was held at Londonderry Crown Court on Friday.
Whoriskey will be sentenced on December 16.