A gangland double murderer has posted sickening rap videos and footage on social media illegally documenting his ‘easy and relaxed’ life behind bars.Devonte Campbell, 31, who was part of the Mali Strip gang which terrorised part of London, has published a succession of ‘drill’ music videos on YouTube, some of which show prison scenes while others appear to be made with AI.In some of the sequences, lyrics vowing violent revenge on rivals are accompanied by images of guns, blood-drenched knives and fast cars.One clip has a misogynistic title suggesting a sex act accompanied by a picture of a vacuum cleaner.Retired Metropolitan Police detective Peter Bleksley said: ‘This is outrageous. He needs to face extra prison time for this clear breach of the law.‘This is a huge failure of the system. Discipline in the prison system has collapsed.’In his Instagram posts, Campbell includes a picture of Rolex watches worth £10,000 – although it is unclear whether the image was taken behind bars – and shows him ‘giving back to the community’ by handing out drinks cans and sweets to other inmates.And his remarks show no remorse for his horrific criminal history – as he declares ‘I still push this Rambo (knife) in you’. Mugshot of Devonte Campbell, then aged 20, when he was jailed for double murder in 2015 Still from video of Campbell as drill rapper 'KayKay', superimposed with women on either sideIn a video from last November, Campbell – posting on YouTube under the profile Official KayKay 1017 – boasts of having earned ‘£20k a week’ and vows revenge on a rival gang.In a reference to stabbing, he raps: ‘Test the water, you’re gonna get wet. Tesco boys, you’re gonna get splashed, face, neck’.Campbell then states ‘don’t cross that line’ – or warns, with a gun gesture, ‘just wait and see’.In another YouTube video called ‘Hate My Tunes’, from July last year, Campbell raps in gangster slang: ‘My blades been wet. I ching that face, I ching that neck.’He adds: ‘Too many men got cheffed (stabbed)… you know you dead”And posting on Instagram last November, Campbell claims criminal rivals risk being ‘splashed’, or stabbed, that he is able to smoke and sell drugs in jail, and boasts of attacking someone with a zombie knife.He said: ‘Test the waters, you’re going to get splashed face, neck belly and back. I did get locked for splashing, first day in I was smoking trash. It’s true that I smoked your man with a zombie one, they think I’m mad. He got cut, that kitchen tore his guts.‘I’m smoking weed and I sell drugs like a pharmacy I stick it straight through arteries.’In a further Instagram post from October 2024 which shows him handing out cans of energy drinks to fellow inmates as music of him rapping plays in background, he declares: ‘I ain’t saying nothing like I’m in the interview.‘If we’re talking about opps (rivals), then you know I’ve chinged a few. More than two. I’m for the streets like a prostitute. Picture me in the station and my lips glued, he’s trying to stick me up but I have my stick too… I’ll still push this rambo in you.’The Prison Service is understood to be liaising with YouTube and Instagram to have footage taken inside prison taken down but is powerless to remove the AI-generated videos.The KayKay account on YouTube has 600 followers, allowing Campbell to potentially benefit financially through asking for ‘fans’ to provide funding. It is not known whether he has done this.In one video, he is even ‘interviewed’ by a fellow inmate and treated as an apparent celebrity.Mr Bleksley added: ‘The idea he is profiting from his crimes is of real concern. Other criminals will see this and act accordingly.’ 'KayKay' makes gun gesture during rap video which has been posted on YouTubeOne of Campbell's YouTube videos has a misogynistic title suggesting a sex act His YouTube profile description states: ‘Kay Kay is An Underated (sic) Artist Dropping Heat From The Behind The Door. Free Him.’Meanwhile, Campbell’s instagram posts include the caption: 'Hard times never last. But solid people do.'Campbell was 20 in 2015 when he was jailed alongside Omar Hassan, 22, for the slaying of Aaron Carriere, 21, and Josiah Manful, 20.The victims were lured to a quiet residential road in Leytonstone, East London, early on 1 March 2014, then "boxed in" by their killers and stabbed 24 times in less than a minute in what the Old Bailey heard was a "swift, frenzied, utterly brutal" attack.Campbell – serving a suspended prison sentence at the time of the murders for dangerous driving and perverting the course of justice - was jailed for a minimum of 35 years and Hassan for at least 26 years.Sentencing, Judge John Bevan highlighted the acts of extreme violence committed by "feckless" youths. Campbell's instagram page includes a shot of a Rolex watch and designer Vianni baseball capsThe two victims were set upon in their black Ford Fiesta having been trapped by four cars so they had no means of escape.A group of about 12 men leapt out of the cars and, armed with knives, set upon the two men, stabbing them dozens of times.The attack was all over in just 45 seconds and Mr Carriere and Mr Manful were left slumped in the car, mortally wounded.Mr Manful managed to get out of the driver's seat to call for help and a woman who lived nearby came to their aid and comforted the two men in their final minutes.Both were pronounced dead at the scene.Although there were drugs and cash in the car, only one item was stolen - Mr Carriere's mobile phone which contained his drug-dealing "client list". Devonte Campbell, aka KayKay, pictured in a rap video apparently filmed in his prison cell Campbell was said to be part of the Mali Strip gang, another member of which murdered 14-year-old Jaden Moodie (above) in 2019Campbell claims to be a ‘G’, or ‘gangster’ with the Mali Strip gang, one of around a dozen street gangs thought to be active in north east London in recent years – whose leaders are reported to be from the Somali community.It is said to be heavily involved in child exploitation and active grooming of young children to peddle drugs – and members have ruthlessly disposed of rivals.Mali Strip member Ayoub Majdouline, 19, was found guilty of the murder of Jaden Moodie, who was just 14 when he was stabbed to death in Leyton in 2019. Jaden, whose mother had brought him to London to escape criminality in Nottingham, was dealing drugs for a rival gang, the Beaumont Crew.At Majdouline’s trial, prosecutor Oliver Glasgow QC said the ‘cowardly’ attack was part of a ‘shocking wave of gang crime’ involving ever younger people.A Ministry of Justice spokesperson said: ‘Having a phone behind bars is unacceptable. We are investigating how this was able to happen.‘We are investing £40 million in new security measures to clamp down on illicit items, and those who break prison rules can face extra time behind bars.’The ministry said action was started ‘immediately’ to have the ‘any posts filmed in custody’ taken down.YouTube's owner, Google, and Instagram owner Meta have been approached for comment.