Olympic swimming champion Grant Hackett was reported missing on Thursday after a family fight which left him with cuts and bruises. Hackett was once a star of the swimming sport but after a while he became ‘mentally disturbed’ and could not continue with the same winning streak in the sport.

Grant’s father, Neville Hacket, while talking to reporters said that he was worried about his son’s safety describing him as ‘mentally disturbed’. Just a few days before his disappearance, Grant had put up a picture of his bruised face on social media, claiming his brother had beat him up.

“He´s definitely a missing person and he´s definitely mentally disturbed,” Neville Hackett told reporters on the Gold Coast.

“We´re extremely worried,” the Courier Mail quoted him as saying.

After Grant’s disappearance, the police briefly detained his father, who was later released after questioning.

Neville said that he had reported his son missing on Thursday after he failed to show up for appointments with a doctor and a lawyer.

Grant’s brother, Craig said that his brother had mental health problems and was no longer the same person he used to be. Craig fell short of telling the media what the recent fight between both the brothers had been about.

On Thursday, Grant posted a picture of himself on Instagram showing a cut and blackened eye with blood on his nose. “My brother comments to the media… but does anyone know he beat the shit out of me,” Grant wrote in the caption.

Grant retired after the 2008 Beijing Olympics, having won the 1500m freestyle at both the 2000 Sydney and 2004 Athens Games. He also claimed four world titles in the 30-lap event.