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Crazed Brazilian serial killer Tiago Rocha has asked police guarding him in his cell if it would be okay to murder other inmates.

The notorious motorcycle murderer has confessed he still feels the urge to kill despite admitting to 39 shootings.

Police chief Eduardo Prado, one of those in charge of the investigation into the slayings, said: “He asked whether he would face trial if he killed someone else in custody.

“He still wants to kill. His attitude is very strange.”

The 26-year-old, captured last week after a four-year rampage, claims he killed out of rage after being sexually abused by a neighbour as a child.

He has confessed to killing homeless people and transvestites at random in his home city of Goiania before starting to kill young women this year as he cruised the streets on a motorbike.

(Image: Getty)

His last victim, Ana Lidia Gomes, was just 14 when he shot her dead as she left her home.

He was caught after a failed attempt to kill another victim on October 12 who later identified him along with a bar worker.

His modus operandi was always to shout ‘robbery’ before pulling the trigger but he would flee the scene without taking anything

Police chiefs have said they wouldn’t be surprised if Rocha, whose full name is Tiago Henrique Gomes da Rocha, is found guilty of more than the 39 murders he has confessed to.

He has been put on suicide watch after surviving slashing his wrists in his cell with a smashed light bulb.

Mr Prado said: “We’re monitoring him constantly. He doesn’t love himself and he’s already attempted suicide.

(Image: Getty)

“He constantly asks for dental floss to take with him when I’m with him. When you ask him if it’s so he can kill himself he just laughs sarcastically.”

If Gomes da Rocha ends up being convicted of the crimes he is said to have confessed to, he will gain a place in the record books as one of the world’s worst serial killers.

The list of the 15 most prolific modern serial killers is topped by Colombian Luis Garavito, a child murderer and rapist known as La Bestia or The Beast.

He is thought to have killed more than 400 mainly street children. His proven victim count is 138.

Pedro Rodrigues Filho, Brazil’s most prolific killer, claimed to have killed over 100 victims, 47 of them inmates. He was convicted of killing 71 people.

He killed his first two victims at the age of 14 and murdered his father and ate a piece of his heart.