A teenage thief-turned-serial killer nicknamed Lucifer has been blamed for murdering 48 other inmates during his 25 years behind bars.
Marcos Paulo da Silva makes Britain's most dangerous prisoner Charles Bronson look like a pussycat in comparison.
His signature tune is to cut his victims' heads off and disembowel them after killing them.
The 42-year-old Brazilian, 18 when he was first incarcerated for petty theft in 1995, is said to have murdered and assassinated five inmates in one go in Serra Azul Jail in Sao Paulo in 2011 in one of his most bloodiest attacks to date.
He now faces dying himself behind bars after his transformation into a prison killing machine left him with multiple convictions and jail sentences totalling 217 years, although according to local reports he has yet to be tried for many of his crimes.
Marcos Paulo da Silva, 42, told a judge he had 'no regrets about killing all these people'
Da Silva is said to have told a judge recently: 'I have no regrets about killing all these people.
'They were rapists and thieves who took advantage of other inmates and robbed them.'
His astonishing prison history was laid bare in a recent report by Brazilian online firm UOL which has been picked up by newspapers in South America as well as Portugal.
He has been described as the leader of a gang of assassins created with the mission of murdering members of the PCC, one of Brazil's leading gangs said to have been formed by inmates as a self-protection group in the country's brutal prison system.
Prison guards told UOL it was only a 'question of time' before da Silva, covered in tattoos which include skulls, devils and a Swastika, kills again once he is transferred to a new prison.
He switched allegiances and turned against PCC after joining the gang as a 19-year-old following his first teenage conviction.
He reportedly used a fire extinguisher to knock his Serra Azul Prison victims unconscious before beheading them with a home-made knife in his most infamous jail massacre to date.
He is said to have yelled: 'I love this, there's so few, I want to kill more prisoners' as he snubbed out their lives.
Da Silva is said to have murdered and assassinated five inmates in one go in Serra Azul Jail in Sao Paulo in 2011
The number of prisons willing to take him is now drying up. Psychologists say he is not mentally ill but does suffer from a personality disorder that needs to be urgently treated.
Armed robber Charles Bronson, 67, has spent the last 45 years in prison after repeatedly having his sentence increased for attacking prison staff and taking them hostage.
He was first sentenced to seven years in jail. He was given life for kidnapping a prison teacher in 1999 after several sentence extensions.
His life was played out on the big screen with actor Tom Hardy playing him in the film Bronson to great critical acclaim.
In 2014 Bronson, born Michael Gordon Peterson, announced he was changing his name to Charles Salvador as a tribute to the artist Salvador Dali.