A 15-year-old boy, involved in a tragic incident, reportedly admitted to police, “I stabbed another boy in the leg,” following a fatal altercation.

The victim, a 17-year-old male, succumbed to stab wounds inflicted on his thigh after an altercation erupted in a park located in Sydney’s northwest. This unsettling event unfolded around 4:20 PM on Monday.

Roughly three hours post-incident, the younger teen, accompanied by a parent, voluntarily went to a police station where he was promptly charged with murder.

Due to legal constraints on identifying minors, the identity of the 15-year-old remains undisclosed. He appeared before a children’s court on the subsequent Tuesday.

In court, Magistrate James Viney addressed a police request for DNA samples, reading from an affidavit submitted by an officer. The document asserted that the victim was a 17-year-old with no prior criminal charges.

‘It is asserted in the affidavit the victim was a 17-year-old with no criminal charges,’ he said.

‘It is asserted the young person set upon the deceased unprovoked and stabbed him in the groin area.’

The court also heard the 15-year-old was on police body-worn camera footage telling an officer ‘I stabbed another boy in the leg’.

A teenage boy allegedly stabbed to death has been remembered as ‘sweet’ and ‘genuine’

A teenage boy was allegedly stabbed to death behind Rouse Hill High School (pictured, paramedics at the scene)

When asked who he was admitting to stabbing, he allegedly gave police the name of the deceased.

Police allege witnesses described seeing the victim’s attacker dressed in a balaclava, hoodie, shorts and running shoes, a description allegedly matching that of the 15-year-old.

They argued scrapings taken from under his fingernails would likely contain DNA evidence that matched the deceased.

A court order is needed to take DNA evidence from an accused juvenile because they are not considered capable of giving informed consent.

The 15-year-old sat quietly in the courtroom, wearing a black hoodie and sporting a mullet haircut with shaved sides.

The boy did not apply for bail and was remanded in custody for eight weeks, when the case returns to court.

The stabbing happened in broad daylight within sight of numerous people walking nearby.

The killed boy’s heartbroken girlfriend shared her grief online and pledged: ‘I’ll love you forever.’

The 17-year-old’s heartbroken girlfriend has led tributes online 

Police said those involved in the confrontation were not from the nearby school and officers believe it was not a random attack 

The Daily Mail understands the alleged victim’s parents migrated to Australia from Europe more than 15 years ago before settling in the city’s north-west, where the 17-year-old was active in the local sporting community.

The boy’s girlfriend said he made the ‘little things fun’ and ‘brought a smile’ to her face ‘every single day without fail’. 

‘[Name redacted] you will be remembered by all,’ she wrote online.

‘I love you so much and you will be forever in my heart.

‘You don’t deserve this and never did, you are a strong boy and you deserve the world.

‘I don’t know what I’m going to do without you baby, but I know you would want me to live and stay strong, so I’ll live for you ML [my love].’

One friend described him as a ‘sweet, genuine boy’, while others simply wrote ‘fly high [name redacted]’ and ‘forever 17’.

It’s understood the teenage boy was allegedly stabbed in the thigh (pictured, emergency services at the scene) 

‘Gonna miss you bro,’ another mate said.

Authorities remained at the scene on Tuesday as locals laid flowers in tribute to the slain teen.

Police said those involved in the confrontation were not from the nearby school and officers believe it was not a random attack.

Several female witnesses who were in the park at the time rushed over to help the victim.

Paramedics were called but the teen died soon after.

‘It would have been a horrifically confronting situation for those people and I can only praise them for their efforts,’ Detective Superintendent Naomi Moore told reporters on Monday evening.

‘It was a potentially dangerous situation they were walking into, but they thought nothing of themselves to go in and render aid.’

NSW Premier Chris Minns sent his condolences to the teenage boy’s family and friends.

‘I am deeply saddened by the death of a teenage boy at Rouse Hill and extend my sincere condolences to his family and friends,’ he said in a statement.

‘It is an unimaginable loss, and the whole community will feel the impact.’

Local federal MP Michelle Rowland said she was deeply saddened by the incident.

‘There is no place in our community for these acts of senseless violence, and I know this news will be particularly distressing for local families,’ she said.

The accused murderer is scheduled to return to court on January 23.