Justin Bieber castration murder plot details emerge (AUDIO)

More details have emerged in the bizarre Justin Bieber castration and murder plot.

Audio from phone calls between the alleged mastermind of the plan and a hitman shed new light on the plan.

Dana Martin, who is already doing time in New Mexico for the murder and rape of a 15-year-old girl, hired the nephew of a jailhouse friend to mutilate and kill the Canadian pop star, said Extra.

Tanner Ruane was to carry out the kidnapping and brutal murder of Bieber and his bodyguard in New York after a concert at Madison Square Garden, reported TMZ.

The new audio suggests the mastermind and his hitman had spent a great deal of time on the plot.

It also suggest both men were not particularly intelligent, plotting a murder on a jail phone.

“Did he go over the Bieber thing with you?” Martin asked Ruane in a taped phone conversation from prison.

“Nah. The way I like to work dude, I like to know as little as possible," Ruane replied.

The two discussed the plan to strangle Bieber with his signature Paisely scarf.

“Tie it really tight, and that cuts off all the oxygen, and then tie it in the back again, really tight. That seals the deal,” Martin said in the tape, reported ABC News.

They also planned to use garden tools to mutilate the star.

“We went and bought the hedge clippers,” Ruane was heard saying on the audio recording.

“You’re gonna give me 5 large ($5,000) for each one I get.”