A man who beat his girlfriend's five-year-old son to death in public has seen his jail sentence increased by two and a half years - after he stamped on his cellmate's head.
Marvyn Iheanacho was already serving 18 years in prison for the shocking murder of Alex Malcolm in November 2016.
But he will now serve two and a half more years after attacking his cellmate for waking him up too early, Court News reports.
Iheanacho's cellmate was left with broken bones in his face after the apparently unprovoked attack in Belmarsh prison.
Iheanacho, 39, was jailed for battering his girlfriend's child to death after he lost one of his shoes.
During the trial, a witness told the court that Alex shouted "sorry" as he was attacked in Mountsfield Park, South London
Iheanacho was taking Alex to buy a DVD when he suddenly flew into a rage.
Another witness said they saw Iheanacho talking on his phone while the child lay on a bench, his arm dangling down. They claimed he was saying the child had "lost" something and had fallen asleep.
Rather than taking Alex to hospital, Iheanacho took him to nearby mini-cab office and got a taxi back to their home in Beckenham, where he told the child's mother, Lilya Breha, that Alex had fainted and fallen on his knees.
When she tried to call an ambulance, the court heard that Iheanacho attacked her and tried to choke her, and only stopped when he released Alex had turned blue.
A post-mortem found that Alex had suffered head injuries as well as extensive bruising to the face and body. He died two days after the attack.