Former jockey Paddy Donaghy has died aged 39 after allegedly being involved in a physical altercation with his brother Joseph.
Police in Northern Ireland have launched an investigation into the incident.
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Joseph Donaghy has been charged with causing grievous bodily harm relating to the alleged assault.
His defence lawyer says he is “absolutely grief-stricken by what has unravelled”.
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Paddy died in hospital after allegedly being hit in a one-punch assault, and Joseph has since appeared in court.
“Detectives are investigating the circumstances surrounding the death of a man aged in his thirties,” the Police Service of Northern Ireland (PSNI) said in a statement.
“The man died in hospital on Sunday, following an incident at a house in Stratheden Heights, Newtownards, on September 7. There are no further details at this time.”
The court heard there was “ a physical altercation” between the brothers after they returned home from a funeral earlier in the day.
A cousin of the pair, Gerard Donaghy, paid tribute to Paddy following his passing.
“My heart aches in a way I can’t really put into words,” he wrote.
Paddy starred in British Flat racing from 2005 to 2014, riding 60 winners in his career.
He also spent time in Bahrain, winning many more races while becoming a respected member of the racing community.
“So sad RIP Paddy gone way to soon,” said ITV pundit Adele Mulrennan.
A death notice for Donaghy on Funeral Times read: “Peacefully in hospital. Late of Stratheden Heights, Newtownards. Dearly loved son of John and Sarah Donaghy.
“Much loved brother of Joseph, Brona and her husband Simon and Sarah. A loving and devoted father of Lennon, a dear uncle to his many nieces and nephews. RIP.
”Service in St Patrick’s Parish Church, North Street, Newtownards on Friday 18th September at 11:00am, followed by committal in Movilla Cemetery. House Strictly Private Family Only.”