A security guard who tried to stop a robbery has been stabbed to death at a Melbourne station, with four teenagers arrested.

Mourners gather at Melbourne train station to honour 22-year-old Aidan Becker, the off-duty security guard, who was stabbed to death last week.

Mourners gather at Melbourne train station to honour 22-year-old Aidan Becker, the off-duty security guard, who was stabbed to death last week.

Mourners gather at Melbourne train station to honour 22-year-old Aidan Becker, the off-duty security guard, who was stabbed to death last week.

Four teens have been arrested after a young man was killed in a brawl outside a Melbourne train station.

Four teenagers have been arrested after a man died during a violent brawl outside a train station in Melbourne’s north east.

A good Samaritan who tried to break up a brawl between teenagers has died in a "savage" edged-weapon attack after four teens set their sights on him.

A good Samaritan who tried to break up a brawl between teenagers has died in a "savage" edged-weapon attack after four teens set their sights on him.

Four teenagers have been charged with murder and armed robbery after a man was stabbed and killed trying to defend a 14-year-old boy from being...

The heroism of an off-duty security guard fatally stabbed while trying to protect a schoolboy from a group of teenagers has been lauded by the boy's...