Peterborough Stalker Jailed at Cambridge Crown Court for Harassing Ex-Partner, 2026

Key Points

• Cambridge Crown Court sentenced 49-year-old Marius Siuipys to three years and three months in prison.
• A jury found Siuipys guilty of stalking and breaching a non-molestation order.
• Siuipys called his ex-partner before showing up at her home, forcing his way into her bedroom, demanding paperwork, and attempting to punch her.
• He then sent her repeated messages and photos on Facebook Messenger and followed her to her new partner’s address.
• The victim fled her house with her children after fearing for her life.
• Investigating officer DC Roberto Scialla Cooper praised the victim’s bravery and called on other domestic abuse victims to report offences to the police.

PETERBOROUGH (Cambridge Tribune) October 9, 2026 – A 49-year-old man who subjected his ex-partner to a campaign of intimidation and attempted physical violence has been jailed for three years and three months following a trial at Cambridge Crown Court.

As reported by police reporting staff at Peterborough Matters and official news outlets of Cambridgeshire Constabulary, Marius Siuipys, of Lincoln Road, New England, Peterborough, was convicted of stalking and breaching a non-molestation order after launching an aggressive campaign against his former partner.

According to official police reports released by Cambridgeshire Constabulary, Siuipys initially contacted the victim over the phone before escalating his behavior by travelling to her residential address. Upon arrival, he forcefully barged into her private bedroom and attempted to punch her, while simultaneously demanding to inspect specific paperwork.

The physical aggression inside the home prompted the victim to flee the property alongside her children to secure a place of safety. However, Siuipys persisted with his conduct.

Court documentation details that he subsequently turned to digital channels, repeatedly contacting her via Facebook Messenger to send threatening text messages and photographs. The escalation culminated in Siuipys turning up uninvited at the residential home of the victim’s new partner.

What Did Investigating Officers Say Regarding the Stalking Case?

Following the court proceedings at Cambridge Crown Court, law enforcement authorities highlighted the severity of the ordeal inflicted upon the victim.

As stated by DC Roberto Scialla Cooper of Cambridgeshire Constabulary, who led the criminal investigation:

“Siuipys subjected the victim to a terrifying ordeal, leaving her genuinely fearing for her life to the point where she had to leave her home with their children. The victim showed immense courage in reporting what happened and supporting the investigation. We would urge anyone experiencing abuse to come forward and seek help. We will listen, support them and do everything we can to protect victims and hold offenders accountable.”

Siuipys was subsequently remanded, tried, and sentenced to 39 months’ imprisonment for his actions.

Background of This Particular Development

Non-molestation orders in England and Wales are civil court orders designed to prevent an individual from using or threatening violence against a partner, ex-partner, or family member, as well as forbidding them from intimidating, harassing, or pestering them. Under the Domestic Violence, Crime and Victims Act 2004, breaching a non-molestation order is a criminal offence punishable by up to five years in prison.

In recent years, law enforcement agencies across Cambridgeshire have implemented stricter multi-agency risk assessment protocols to monitor persistent stalkers and order-breakers. The conviction of Marius Siuipys at Cambridge Crown Court reflects judicial enforcement where civil protective orders are breached alongside violent threats and digital harassment.

Prediction: How Will This Development Affect Local Residents and Victims of Stalking?

This conviction and substantial custodial sentence are likely to have several distinct impacts on the local community in Peterborough and victims of domestic abuse across Cambridgeshire:

1. Deterrence to Repeat Offenders: The imposition of a three-year and three-month prison sentence for breaching a civil protection order sends a strong message to individuals subject to non-molestation orders that the judicial system treats digital harassment and physical threats with high severity.
2. Encouraging Victim Reporting: Publicising cases where police secure convictions based on digital evidence (such as Facebook Messenger logs) and victim testimony may encourage other individuals facing domestic harassment or stalking to seek formal protection orders and report breaches to the police.
3. Resource Allocation for Protection Services: High-profile cases ending in custodial sentences frequently reinforce reliance on local victim support groups and specialized police safeguarding units, leading to greater usage of temporary shelters and legal injunction frameworks for families fleeing domestic violence.