Rhyhiem Barton, who became the 62nd person to be killed this year, appeared on a YouTube channel ran by the former BBC DJ.
The Times reports that the video was a "drill" music clip, a genre of rap music associated with South London often featuring lyrics glorifying violence and criminality.
Mr Barton was a member of the Moscow17 drill crew, according to reports.
In one of his music clips, entitled City of God, a lyric read: "We are at war with the f****** cops".
His name also appeared on a leaked Metropolitan Police database which contained suspected drill gang members.
The teenager's mum Pretana Morgan denied that her son was a gang member and described the streets of the capital as "paved with blood" after she found her son dying from gun wounds near their home in Kennington, South London, on Saturday.
Officers were called to reports of gunshots on Cooks Road, just after 6pm and found Pretana's son, Rhyhiem Ainsworth Barton, dying on nearby Warham Street.
Medics rushed to save his life but the teenager, who was an aspiring rapper going by the name GB, was declared dead at the scene.
Pretana, 38, said: "Let my son be the last and be an example to everyone. Just let it stop. What must be, must be."
She added: "It's not about race, it's not about nation, it's not about culture. Nothing. It's just a human race.
"Just one human race. So children, please let my son be the last."
She told how the rapper and aspiring architect had returned to London just a few weeks ago, after she sent him abroad to live with relatives in Jamaica after he was knifed in the capital.
Ms Morgan, who wept as she talked about her son, said: "I need to hold him. My handsome boy."
She added: "We cannot be doing this all the time, teenagers you need to stop please.”
Beside her on a wall were Rhyhiem's provisional driving licence, a little bag of his baby teeth and a photo of her feeding him when he was a baby.
Rhyhiem's godmother Lacey Main added: "Any loss of life is a loss.
"It doesn't matter where they come from. It doesn't matter what religion, what culture, what skin colour… a life is a life.
"A young life is a young life."
Rhyhiem's close friend Abigael Adeoye, 17, said: "We were friends from when we were young at primary school.
"He was really bubbly, he used to message me and say 'Abigael come and see me'. I should have told him to stay at home yesterday."
Westwood has been accused of profiting on YouTube from gang threat music videos.
The platform, called TimWestwoodTV, has amassed 388million views by broadcasting clips including hundreds of rap videos from mainstream stars and suspected gang members.
At the time a spokesman for Westwood said: “These artists featured on TimWestwoodTV are rap groups not gangs.
“There is no payment or fee to be featured on TimWestwoodTV.
“The freestyle sessions operate at a loss, as they do not even cover the production cost of making the video.
“We have a compliance process of all videos being approved before release by an executive producer in charge of content and editorial guidelines.
“Any threats of violence would be removed from the video.”
Medics had battled to save his life but he was pronounced dead just before 7pm. He was the 15th teenager to be killed on the streets of the capital since Christmas.
The killing is one of 62 fatal shootings and stabbings in the capital so far this year.
A Met Police spokesperson said: "Police were called at approximately 18:05hrs on Saturday, 5 May to reports of gunshots heard on Cooks Road in Southwark.
"Officers, including firearms officers, attended. A 17-year-old boy was found nearby on Warham Street suffering from a gunshot injury."
No one has been arrested in connection with the death.
Anyone with information is asked to contact officers via 101 quoting reference cad 6414/5May or Crimestoppers anonymously on 0800 555 111.
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