A drug addict who beat his 22-month-old stepson to death received a taste of his own medicine after his skull was smashed in by two inmates in prison.

William Andrew O’Sullivan was jailed for nine years last week for the death of Mason Jet Lee in the Queensland.

While awaiting the outcome of his trial, his lawyer told Queensland Supreme Court that he was beaten by two inmates, where his head was kicked in.

William Andrew O’Sullivan was jailed for nine years last week for the death of Mason Jet Lee in the Queensland.

He suffered a severely fractured skull and spent 13 days in hospital recovering.


O’Sullivan did not help his stepson who was clearly in pain in his last days. He simply ignored him or yelled at him to ‘shut up’ when he cried, according to The Courier Mail.



Mason was found with extensive injuries at O’Sullivan’s home in Caboolture, north of Brisbane, in June 2016.

Mason was found with extensive injuries at O’Sullivan’s home in Caboolture, north of Brisbane, in June 2016

The toddler was so severely beaten he suffered anal injuries, a broken leg and a ruptured intestine and spent the last few days of his life vomiting, feverish and dehydrated.

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In addition to his injuries, traces of methamphetamine were found in his blood.

O’Sullivan, a self-described addict, originally tried to blame Mason’s death on paramedics responding slowly after he was admitted to Lady Cilento Children’s Hospital for three weeks in February 2016.

But it emerged they arrived at the property just six minutes after they were called.

The toddler was so severely beaten he suffered anal injuries, a broken leg and a ruptured intestine and spent the last few days of his life vomiting, feverish and dehydrated (Picture: AAP Image/GoFundMe)

O’Sullivan eventually pleaded guilty to four separate charges, including manslaughter and cruelty to a child under 16-years-old (Picture: NINE)

He also claimed his 12-year-old daughter could have beaten the toddler.

He eventually pleaded guilty to four separate charges, including manslaughter and cruelty to a child under 16-years-old.

O’Sullivan was jailed for nine years and will be eligible for parole in less than four years.

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