The jury in the trial of three teenagers accused of murdering Mason Miller after a fatal stabbing at a Northampton park has been sent out to consider its verdicts.

The 12 jurors – eight women and four men – left the courtroom at 2.50pm on Thursday, 12 November, after hearing the judge's final directions.

Closing speeches from the barristers representing the three defendants were delivered over the course of this week – all set out their cases of self defence.

Mason, 20, died after being stabbed at Briar Hill Skate Park in Northampton on Wednesday, 18 February 2026. An 18-year-old boy, who is a defendant, also suffered life-threatening injuries.

Mason (right), 20, died after being stabbed at Briar Hill Skate Park (left) in Northampton on Wednesday, 18 February 2026.

placeholder image — Mason (right), 20, died after being stabbed at Briar Hill Skate Park (left) in Northampton on Wednesday, 18 February 2026.

The trial began on 12 October, with the jury sworn in the following day. There have been several breaks in proceedings, mainly because of legal issues relating to the defendants' ages.

The three defendants, aged 16, 17 and 18, cannot be named for legal reasons. All deny murder and manslaughter.

The prosecution alleges the 16-year-old and 17-year-old murdered Mason and attempted to murder the now 18-year-old. It also alleges the 18-year-old was guilty of Mason's murder.

Prosecutors said the four young men were on opposing sides in a two-against-two fight involving machetes – with Mason and the 18-year-old on one side, and the 16 and 17 year olds on other.

The prosecution allege all three defendants shared a common purpose and were prepared to cause really serious harm.

All three defendants have argued they acted in self-defence.

The 16-year-old denies stabbing Mason and says he did not stab anyone. The 17-year-old admits delivering the fatal wound but denies murder, arguing he acted in self-defence. The 18-year-old denies involvement in Mason's killing and says he was himself a victim of violence.

The indictment contains 12 counts relating to alleged offences on 6 April 2025 and 18 February 2026.

The charges are:

Count 1 – Wounding with intent: The 16-year-old is accused of unlawfully and maliciously wounding the then 17-year-old, now 18, on 6 April 2025, with intent to cause grievous bodily harm.

Count 2 – Wounding with intent: The now 18-year-old is accused of attempting to wound the 16-year-old, with intent to cause him really serious harm. He has pleaded not guilty.

Count 3 – Possession of an offensive weapon: The 16-year-old is accused of possessing a machete in a public place on 6 April 2025.

Count 4 – Murder: All three defendants are accused of murdering Mason on 18 February 2026.

Count 5 – Manslaughter: All three defendants are accused of unlawfully killing Mason on 18 February 2026.

Count 6 – Attempted murder: The 16-year-old and 17-year-old are accused of attempting to murder the now 18-year-old on 18 February 2026.

Count 7 – Wounding with intent: The 16-year-old and 17-year-old are accused of unlawfully and maliciously wounding the now 18-year-old on 18 February 2026, with intent to cause grievous bodily harm.

Count 8 – Possession of an offensive weapon: The 16-year-old is accused of possessing a machete at Briar Hill.

Count 9 – Possession of an offensive weapon: The 17-year-old is accused of possessing a machete at Briar Hill.

Three further counts were also added this week:

Count 1a: The 16-year-old is accused of unlawfully and maliciously wounding the 18-year-old on 6 April 2025. He pleaded not guilty.

Count 2a: The 18-year-old is accused of attempting to wound the 16-year-old on 6 April 2025. He pleaded not guilty.

Count 7a: The 16-year-old and 17-year-old are accused of unlawfully and maliciously wounding the 18-year-old on 18 February 2026. Both pleaded not guilty.

The court is due to sit until 2pm on Friday, 13 November, before resuming on Wednesday, 18 November.

It is now unlikely the jury will reach verdicts until next week.