A man who murdered his partner’s three-year-old son has been sentenced to at least 24 years in prison, while his mother has been jailed for 11 years.

Kemarni Watson Darby died from abdominal injuries on 5 June 2018, after his rib cage was “crushed” at the home he shared with his mother and her partner in West Bromwich.

He was taken to hospital but pronounced dead that evening.

Convicted drug dealer Nathaniel Pope, 32, was found guilty last month of murdering Kemarni.

He also found guilty of three other child cruelty charges.

Kemarni’s mother, Alicia Watson, was cleared of murder but also found guilty of three child cruelty charges.

She was sentenced today to 11 years for causing or allowing his death.

Kemarni had suffered multiple fractures, “some of which would have required force akin to a road traffic accident” or stamping on his body with a “shod foot”, Birmingham Crown Court heard in April.

Recent and non-recent injuries were found, including multiple fractures to both the left and right side of his rib cage, caused by at least four separate events.

The boy had also suffered extensive internal bruising and lacerations to his liver and colon and died of abdominal trauma, which the court heard “was most likely caused by a blow”.

Kemarni sustained additional bruises on his head, mouth, neck, arms, chest, abdomen, back and legs from “repeated and, in all probability, sustained assaults”.

His father, Darren Darby, told the trial he was aware that his son was being slapped, punched and kicked by his “strict” mother.

He also said he had warned Watson, 30, about Pope and asked her to be cautious of him.

Just over two weeks before Kemarni’s death, his father had noticed a lump on the right side of his forehead which was sticking out and a bruise on his lip.

Watson, of Handsworth, Birmingham, told him that Kemarni had walked into something or been clumsy.

Other family members raised concerns about bruises but were given similar explanations.

Kemarni’s maternal grandmother, Paulette Ellis, previously told Sky News she was unaware of most of Kemarni’s injuries and saw “no bruises at all except the ones that he had on his forehead”.

Asked if she questioned them, she said: “We always ask because you know what children are like but Kemarni was a little boy, he would just run and not look where he was going, he would bump into the door, bump into the table”.

She said no one from the family contacted social services.