Dana Martin allegedly recruited two accomplices to carry out the crime

An obsessed Justin Bieber fan in prison plotted to kill and castrate the teen singer, it’s been claimed.

Convicted killer Dana Martin is accused of recruiting two accomplices to strangle Justin, 18, with a paisley tie – his ‘calling card’ – at one of his Madison Square Garden gigs last month.

The trio were also allegedly planning to murder Justin‘s bodyguard and two unrelated victims, believed to be witnesses to one of Martin‘s previous crimes.

Martin, 45 – who is currently serving a 978-year sentence for the rape and murder of a 15-year-old girl in 2000 – has a tattoo of Justin on his leg.

He allegedly put a $2,500 bounty on each of the singer’s testicles.

‘We take every precaution to protect and ensure the safety of Justin and his fans,’ reads a statement from Justin‘s management.

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Anna Duff