A POTTY-mouthed hero who stood up to the Munich gunman as he paraded through a shopping centre slaughtering innocents could be charged for INSULTING the killer.

Thomas Salbey, 57, is also known as "balcony man" after a video emerged of him screaming at terrorist Ali Sonboly from his nearby flat.

4 'Insulting' ... Brave Thomas Salbey hurled abuse at evil baby-faced killer Credit: CEN /Welt

4 Shooter ... Sonboly was distracted by Thomas's insults, potentially saving more lives Credit: CEN

He has been praised around the world for bravely confronting the shooter, even throwing a beer bottle at him to try to stop the horrific rampage that left nine dead.

"All I had was a beer bottle to throw at him, but if I had a gun I would have shot him in the head", the Munich resident has said.

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But German prosecutors are investigating Salbey for potentially insulting the 18-year-old gunman, who shot himself after completing his evil mission.

4 Aftermath ... Spot where Munich gunman Ali Sonboly began his murder rampage Credit: DPA

On 22 July murder-obsessed Sonboly lured local teenagers to a McDonalds restaurant at the Olympia shopping centre to carry out his sick mass-shooting fantasy.

But it is Salbey, who has given interviews since the shooting maintaining his hatred for the killer, that could soon face justice.

4 Tributes ... Sonboly killed nine people after luring young people to a McDonalds restaurant Credit: Getty Images

Spokesperson Florian Weinzierl from the State Prosecutor’s office of Munich said Salbey is being investigated for potentially delivering "insults to the detriment of the Dead".

A court review of the evidence against Salbey is expected soon to decide whether any formal charge will be made.

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