A man who stabbed a Polish mayor to death on stage in front of thousands of people laughed in court as a judge jailed him for life.

Stefan Wilmont, 31, had been found guilty of the brutal murder of Pawel Adamowicz, 53, in Gdansk, in northern Poland, on 13th January 2019.

But as he was sentenced to life behind bars on 16th March, the smirking killer issued a sinister threat to judge Judge Aleksandra Kaczmarek and prosecutors.

Dressed in an orange prison jumpsuit and flanked by police officers at Gdansk District Court, he warned: “We’re all going to end up in the therapy ward anyway, where I’ll be the doctor doing the exam.”

Wilmont stabbed his victim during a live music charity event in Gdansk in front of a horrified audience.

The killer had previously been institutionalised with a diagnosis of schizophrenia.

Adamowicz died the following day from his injuries.

Wilmont’s marathon trial lasted almost a year with 25 hearings with his legal team arguing that he was too mentally ill to stand trial.

His sentence is not yet legally binding and could be appealed.

Wilmont will be able to apply for early release after spending 40 years in solitary confinement, according to local media. He will also have to pay compensation to the tune of PLN 10,000 (GBP 1,865).

It is reported that his sentence will be served in “therapeutic conditions”.

Adamowicz was the Mayor of Gdansk from 1998 until his assassination in 2019.