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Video of the moment Daniel Grogan and family meet before killing Jay Sewell Lee in southeast London

This is the horrifying moment when a vengeful ex-boyfriend and his family prepare to murder the former lover of his former girlfriend in a pathogenic attack.

Training plumber Daniel Grogan, 20, became obsessively jealous after he discovered that Jay Sewell, 18, saw his ex-girlfriend Gemma Hodder, also 18, and made plans to kill him a few days later.

Harrowing images shown during his Old Bailey trial reveal the moment when he met his family and best friend to end Mr. Sewell’s life in Lee, southeast London.

In the clip they see themselves gathering in a park, with a group of them hanging out by the trunk of a car.

Within a few seconds, they run through the park – and a short while later they find their helpless victim with a fireman’s ax, baseball bats, hammers and knives.

Mr. Sewell, sitting in a car with friends and coming from Eltham, South East London, died of a single stab wound on the chest. He was also beaten twice in the legs.

Grogan was imprisoned last Tuesday for life with a minimum duration of 21 years in the Old Bailey.

Daniel Grogan was imprisoned for 21 years

Jay Sewell was murdered by Daniel Grogan

Jay Sewell was murdered by Daniel Grogan

Daniel Grogan (left), 20, became obsessively jealous after hearing that Jay Sewell (right), 18, had started a relationship with his ex-girlfriend Gemma Hodder, 18. He was imprisoned for 21 years

Sewell was mortally stabbed on December 11, 2018 in a street in Lee, South East London after Grogan and supporters appeared armed, stabbing him through his car window

Sewell was mortally stabbed on December 11, 2018 in a street in Lee, South East London after Grogan and supporters appeared armed, stabbing him through his car window

Sewell was mortally stabbed on December 11, 2018 in a street in Lee, South East London after Grogan and supporters appeared armed, stabbing him through his car window

His mother Ann shouted ‘joke’ while she was locked up for seven and a half years and a fight broke out in the public gallery when her husband Robert was 14 and a half years in prison.

Pictured: Gemma Hodder outside the Old Bailey

Pictured: Gemma Hodder outside the Old Bailey

Pictured: Gemma Hodder outside the Old Bailey

The jury heard how Grogan became jealous of Mr Sewell the week before the attack because of his relationship with Gemma.

He repeatedly threatened to kill him and the couple arranged to meet on the night of December 11, 2018.

Mr. Sewell went to meet Grogan with friends and Gemma in the hope that they would stop harassing them.

But they were ambushed by the crowd with weapons and he was stabbed while he was in the car.

An 18-year-old man was also dragged into the attack and he and Mr. Sewell were taken to a hospital in South London.

He was declared dead in the hospital at 10.34 p.m. but his friend survived.

The gang was imprisoned for more than 60 years last Tuesday in Old Bailey in London.

Grogan, from Lee, received a life sentence and must have been behind bars for at least 21 years.

His father Robert, 58, was caged for 14 and a half years for manslaughter, inflicting serious physical injury (GBH) and violent disorder.

Robert Grogan was sentenced to 14 and a half years in prison

Robert Grogan was sentenced to 14 and a half years in prison

Ann Grogan was imprisoned for seven and a half years

Ann Grogan was imprisoned for seven and a half years

Grogan’s parents Robert (left) and Ann (right), both 54, were found guilty of manslaughter, violent disorder. Robert was also convicted of intentional wounds. Grogan was sentenced to 14 and a half years in prison. Mrs. Grogan was imprisoned for seven and a half years

Grogan’s mother Ann, 55, was sentenced to seven and a half years for manslaughter and violent disorder.

Grogan's friend Charlie Dudley stabbed Mr. Sewell. He was convicted of manslaughter, deliberately injured and violent disorder. He showed no emotion because he was imprisoned for 16 years.

Grogan's friend Charlie Dudley stabbed Mr. Sewell. He was convicted of manslaughter, deliberately injured and violent disorder. He showed no emotion because he was imprisoned for 16 years.

Grogan’s friend Charlie Dudley stabbed Mr. Sewell. He was convicted of manslaughter, deliberately injured and violent disorder. He has 16 years

His cousin Liam Hickey, 20, was imprisoned for three years for GBH and violent disorder.

Grogan’s friend and neighbor Charlie Dudley, 26, was imprisoned for 16 years for manslaughter, GBH and violent disorder.

His sister Francesca, 30, was previously sentenced to 12 months for violent disorder.

Her friend Jamie Bennett, 32, was previously sentenced to 20 months in prison for violent disorder.

A 17-year-old boy who cannot be named for legal reasons, previously received a nine-month rehabilitation order and a supervision order.

A victim impact statement from mother Sewell, mother Sharon Louch, read: “It hurts me to know that Jay will never be able to make his dreams come true.

“He is my first thought when I wake up and the last before I go to bed. I do my utmost to protect my children against the pain, but I cannot. They all know they will never see their brother again.

Family friend Jamie Bennett (above), 31, and a 17-year-old boy were convicted of violent disorder. He was sentenced last year

Family friend Jamie Bennett (above), 31, and a 17-year-old boy were convicted of violent disorder. He was sentenced last year

Family friend Jamie Bennett (above), 31, and a 17-year-old boy were convicted of violent disorder. He was sentenced last year

“We as a family have taken all the necessary steps to ensure that we have been there to support Jay and show that we care about him.

‘I didn’t work and had so much time away from my children in a place in their lives that they needed me the most.

“There is no punishment that this court or another can come close to healing the pain or making up for not being able to look at my Jay’s face or hear him smile.

“I didn’t come here and didn’t expect it. However, it gives a glimmer of hope that those responsible have been called to account for their actions.

“Jay, you were a blessing and made us proud from the day you came to us until the moment you were taken.”

Francesca Grogan

Francesca Grogan

Liam Hickey got three years

Liam Hickey got three years

Grogan’s sister Francesca (left), 29, was found guilty of violent disorder and was sentenced last year. His cousin, 19-year-old Liam Hickey (right) was convicted of violent disorders and wounded on purpose and imprisoned for three years

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