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.
‘Intensive work’ continuing to agree multi-year budget for Northern Ireland
Strength of evidence against man charged with murdering Lyra McKee questioned
Teenage boy arrested over cyber attack on schools’ IT system
Ulster University to cut up to 450 jobs amid funding pressures
Northern Ireland MPs call on Prime Minister to act amid fuel protests