While the exact circumstances of the incident are still being determined, homicide detectives examined CCTV footage showing several cars and people wandering around at the time of the stabbing.
Mr O’Donnell’s death follows the fatal stabbing of a 44-year-old man in Port Mebourne on Friday, and father-of-two Nathan Gent who was killed at a party in Norlane on Friday night.
His brother, Yahn O’Donnell, confirmed it was Paul who had been killed but would not comment further when contacted by the Herald Sun.
“I can tell you its horrible,” he said on Facebook.
“I don’t think I will ever get my head around it
“Sad days indeed.”
Jake Hewgill, who was often seen at his shop, said Mr O’Donnell was like a father to him.
“I am so broken over this,’’ an emotional Mr Hewgill told the Herald Sun.
“I spent five years with him through everything and now there’s nothing. I don’t know what to do.”
Paramedics were called to the Olive Grove address around 7.45pm and attempted to resuscitate Mr O’Donnell, but he was pronounced dead shortly after.
It is not known who called triple-0.
Surrounding roads were cordoned off while homicide detectives scoured the area for clues. Detectives remained on site until 3am while they completed their investigations.
Earlier this month Mr O’Donnell told his social media followers he was at the Supreme Court. “Here we r again still no Justus for my son,” he wrote.
Neighbouring business owners said Mr O’Donnell was polite, quiet, and “a really nice guy” who kept to himself and was someone who always offered to lend a hand.
They said the industrial area was not dangerous and there had been no previous trouble.
No arrests had been made by last night.
The mechanic’s shop where the stabbing took place specialised in repairing pre-2008 BMWs. Police investigations are continuing.