The 35-year-old is serving a five year sentence

A jailed Doncaster bareknuckle boxer is at the centre of an investigation after he gave a YouTube interview from his jail cell.

Brett May, who is serving a five year sentence for harassment and intimidation, has given an interview to a YouTuber from behind bars at HMP Manchester.

placeholder image — Doncaster boxer Brett May. | Iconic

The fighter apparently used a mobile phone inside a cell at the jail, previously known as Strangeways, to record a piece for the Not Guilty TV channel.

Under UK law, inmates are not permitted to give video interviews to the media.

Unauthorised recording or streaming is also illegal, as is possessing a mobile phone.

Face-to-face and phone interviews are allowed, but only in very specific circumstances and with the permission of the prison governor.

Described as an 'exclusive prison interview', the video, entitled 'Brett May breaks silence from HMP Strangeways', has been watched almost 30,000 times.

It's not the first time May has given an interview to Not Guilty TV seemingly from behind bars.

In January the channel posted a phone interview with May, apparently from inside HMP Hull.

In April this year, he was sentenced following a trial at York Crown Court.

May faced a charge of harrassment putting his victim in fear of violence, to which he was sentenced to two years and ten months behind bars.

He also faced two separate charges of intimidating a witness, each which carried a jail time of 10 months.

In addition, he was jailed for six months for sending images on a phone while inside prison, adding another six months to his sentence, to bring about a total sentence of five years.

A charge of blackmail was discharged, -and a not guilty verdict was formally entered by the court.

A restraining order was also ordered for 10 years.

It is the latest in a long line of controversies for the Doncaster fighter.

In August last year, May traded insults with another fighter online after a highly anticipated fight - reportedly with a £20,000 prize - failed to take place, with Carlisle fighter Danny Christie and May hurling abuse at each other through videos.

And in February last year, a fight between the pair, due to take place at Barnsley’s Metrodome, was called off following police concerns after a war of words erupted between the fighters and their supporters.

In 2018 he was 'left for dead' after a knife attack which left him needing 85 stitches.