A FATHER has died after one brutal punch, allegedly delivered by his own son, sent him into a coma.

Morgan Isles-English, 25, was approached by his father Mark English, 53, who he had not seen in four years, in Brisbane, Australia on Monday at 4pm local time.

4 Mr English pictured lying unconscious on the street in Brisbane on Monday Credit: Jorge Branco / Fairfax Media

4 The 53-year-old was placed in a medically induced coma shortly after arriving at hospital Credit: Jorge Branco / Fairfax Media

Police said the pair started a “brief verbal exchange” before Isles-English allegedly punched his estranged dad in the mouth causing him to smash his head on the concrete.

The 53-year-old has now reportedly died from his life-threatening head injuries.

Investigators are considering upgrading the charges against Isles-English who was initially charged with grievous bodily harm.

The Brisbane Times reports that the son fled the scene as his father lay unconscious, face down on the street, and was given first aid by his partner Varri Telfer who waited for an ambulance.

He was rushed to the Royal Brisbane and Women's Hospital suffering life threatening head injuries and was placed in a medically induced coma.

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Isles-English, from Teneriffe in suburban Brisbane, was arrested and charged on Monday night with grievously bodily harm.

On Tuesday, the young man appeared visibly distressed at Brisbane Magistrates Court where he repeatedly hit his head against the glass of the dock.

He called out to a woman thought to be his mother in the public gallery asking about his father’s condition.

When she indicated that Mr English was still in a coma, the 25-year-old broke down in tears.

Isles-English reportedly shouted to his mother: “I love you mum” to which she mouthed back “I love you too.”

The defendant did not apply for bail and the case was adjourned until August 15.

4 Mr English was suffering from life-threatening head injuries when he arrived at hospital Credit: Jorge Branco / Fairfax Media

4 The defendant's mother refused to answer questions outside the court Credit: 9 News

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