A 22-YEAR-OLD Islander has been jailed after beating a man up in his mother’s house –while serving a community service order for an almost identical offence.

Matthew Sidney Chmielinski first appeared before the court in May 2024 after pleading guilty to throttling a man at his residential address, malicious damage and spitting at a police officer.

He was handed a 360-hour community service order, a 24-month probation order, and made subject to a five-year restraining order.

But while serving out his sentence, Chmielinski committed another violent assault against a separate victim in the early hours of 21 October 2025.

He appeared at the Royal Court yesterday to be sentenced before the Superior Number – which sits for the most serious cases – for attacking his second victim, and re-sentenced for the offences committed in May 2024.

Crown Advocate Luke Sette, prosecuting, said the most recent offences were “driven by jealousy or anger”.

He explained that Chmielinski went to the victim’s home in St Helier, where he lived with his mother.

Chmielinski forced entry into the property before assaulting the victim – said to be harbouring the defendant’s then-girlfriend – by pushing him onto furniture, pulling his hair and repeatedly striking his head against a wall.

The “unprovoked” assault woke up the victim’s mother, who was asleep upstairs.

“Upon seeing the assault, she was made to feel in fear for her son’s life and safety”, said Crown Advocate Sette.

Officers found blood staining and broken glass at the scene, while the victim suffered injuries requiring medical treatment.

In a statement about the impact of the offending, the young man that Chmielinski attacked said he had become “jumpy and anxious” since the incident.

He further described being in “huge fear” of the defendant and asked the court to grant a restraining order prohibiting direct or indirect contact with both him and his mother.

Advocate Chris Baglin, defending, said his client would not be contesting the restraining orders and was “resigned to receiving an extension of his time in custody”.

He added that the offending “came out of a difficult situation” comprising “two friends” and “one girl”.

He said that the alcohol use had “contributed to Mr Chmielinski’s poor consequential thinking”.

Bailiff Robert MacRae, presiding, referred to an “ongoing and entrenched pattern” of “unacceptable” and “violent” behaviour from Chmielinski.

“The principal offence you committed on the [first] occasion was a very similar offence for which you now fall to be sentenced, involving as it did a grave and criminal assault committed upon a man in his own home,” he said.

“You have been given a number of last chances by the court, and you’ve chosen to reoffend in this case by attacking someone in their own home again.”

Turning to the second incident, he added: “It is a very serious offence to force entry into occupied residential premises at night for the purpose of carrying out an assault.

“This was an unprovoked assault on a man you knew in the presence of his mother, who was so concerned that she telephoned the police.”

Delivering the court’s sentence, Mr MacRae handed Chmielinski a total sentence of three years and nine months in jail.

The term comprises 21 months for the illegal entry and subsequent grave and criminal assault in October 2025, and a two-year sentence for previous offences committed in May 2024.