Detectives believe a middle-aged man was stabbed to death outside a Sydney train station by 29-year-old Brian Lee in a "random" weekend attack.
Lee was charged with murder after the victim - 56-year-old Klaus Petr - was found by members of the public near Hurstville train station on Saturday morning.
Police say the victim suffered "severe lacerations".
They seized an "edged weapon" when arresting Lee nearby less than 30 minutes after the attack. Lee lives on Patrick Street just north of the train station.
NSW Police allege Mr Petr was killed after 6am in a small park near the station.
He was found near the station entrance by people who'd been practising tai chi in the park.
His wife, Ann, described him as a kind and quiet person.
"I never think (sic) anything like this happen to him at all," she told the Seven Network on Sunday.
"He's a very good person. I just feel shocked."
Lee was arrested following a tip-off from the public. News Corp Australia reports it was his brother who rang authorities.
A NSW Police spokesman told AAP that detectives don't believe Lee knew the victim.
"It appears to be random," the spokesman said on Sunday.
The 29-year-old was charged with murder overnight and wasn't required to appear when his matter was briefly mentioned in Parramatta Local Court on Sunday.
His legal aid solicitor said Lee wasn't applying for bail and it was formally refused by Magistrate Daphne Kok.
Lee is due back in court at Burwood in mid-March.