A man accused of unleashing a fatal one-punch attack on his father has again broken down in a Brisbane court and shouted "I love you" to his mother.
Mark McGrice died on Tuesday, the day after his 25-year-old son Morgan Isles-English allegedly punched him during a confrontation in Brisbane's CBD.
It's alleged the blow caused the 53-year-old to fall back, strike his head on the footpath and lose consciousness.
Mr McGrice was taken to the Royal Brisbane and Women's Hospital with life-threatening injuries but did not survive.
Isles-English was originally charged with one count of grievous bodily harm, which was upgraded to unlawful striking causing death.
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He reappeared in court on Wednesday and did not apply for bail.
As he was led from the dock, Isles-English sobbed and shouted "I love you" to his mother who was sitting in the public gallery.
He had also cried, paced and banged his head on the glass of the dock when he faced court on Tuesday.
Outside court on Wednesday, Homicide Victims' Support Group general manager Ross Thompson pleaded for people to think twice before they act.
"A whole family has been destroyed here just through one stupid act of violence that could have been avoided," Mr Thompson said.
"It's devastating."
Isles-English's defence lawyer Trent Jones declined to comment.
The case has been adjourned to August 15.
