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She drove into a harbour knowing her passenger could not swim: the Marta Herda murder case

Polish national Marta Herda escaped through the driver's window after driving a car through the barriers at Arklow harbour with 31-year-old Csaba Orsos inside. A jury convicted her of murder, two appellate courts refused to disturb the result, and she was later transferred to Poland to continue serving the Irish life sentence.

Published 26 July 2026 · Remigration Ireland case ledger

MurderMajority jury verdict

LifeMandatory sentence

Appeals closedCourt of Appeal dismissed; Supreme Court leave refused

TransferredPolish prison, 2023

The legal record is no longer an allegation. It is a murder conviction that survived a full appeal. The Court of Appeal described as “fanciful” the proposition that a deliberate high-speed drive off the pier was not intended to kill or cause serious injury. Herda denied murder and maintained that the plunge was an accident; the jury rejected that account.

The deliberate drive into deep water

Shortly before 6am on 26 March 2013, Herda drove a Volkswagen Passat at speed along South Quay in Arklow, through crash barriers and into the harbour. Her passenger, Hungarian national Csaba Orsos, could not swim. Herda knew that. She got out through the open driver's window and survived; Orsos did not.

His body was recovered from a nearby beach. The post-mortem evidence established drowning, not fatal crash injuries. Evidence at trial included that the handbrake had been applied before the car entered the water and that the driver's window was the only window open. The prosecution case was that this was a planned killing, not a loss of control.

From charge to a mandatory life sentence

Herda, born in 1987, had come to Ireland from Poland at the age of 19. Gardaí arrested her at her Arklow home on 10 October 2014 and charged her with Orsos's murder. Contemporary reporting says she later travelled to Poland while on bail and returned; the available record does not support describing that journey as an escape or extradition.

She pleaded not guilty. After a 17-day Central Criminal Court trial, the jury returned a majority guilty verdict on 28 July 2016. Mr Justice Patrick McCarthy imposed the mandatory life sentence. A majority verdict is still a lawful conviction, but it should not be inaccurately reported as unanimous.

Two attempts to overturn the result failed

The Court of Appeal heard Herda's challenge in July 2017 and dismissed every ground on 12 October 2017 in DPP v Herda [2017] IECA 260. The judgment records the evidence and explains why the jury was entitled to find an intention to kill or cause serious injury.

Herda then sought permission to appeal to the Supreme Court. The application was lodged on 1 December 2017 and refused on 21 May 2018 in DPP v Herda [2018] IESCDET 76. That refusal left the conviction and life sentence in place.

Transfer to Poland did not cancel the sentence

In November 2022, the Irish authorities approved Herda's request for transfer under the Transfer of Sentenced Persons Act. By 29 October 2023, reporting confirmed that she had been transferred to a prison in Poland to serve the balance of the Irish life sentence.

That distinction matters. The transfer was not a deportation, release, acquittal or cancellation of punishment. It changed the country administering the sentence. The last located public report places her serving it in Poland; without a current Polish custodial record, this page does not claim more about her present location or status.

Case chronology

26 March 2013: Herda drives through barriers into Arklow harbour; Csaba Orsos drowns.
10 October 2014: Gardaí arrest Herda and charge her with murder.
28 July 2016: A Central Criminal Court jury convicts her by majority verdict; the mandatory life sentence follows.
12 October 2017: The Court of Appeal dismisses all appeal grounds.
21 May 2018: The Supreme Court refuses leave for a further appeal.
November 2022: Her transfer request is approved.
By 29 October 2023: Herda is reported transferred to Poland to continue the sentence.

What can honestly be said about the taxpayer cost

The Irish Prison Service reported an average annual cost of €99,072 per available staffed prison space for 2024, excluding capital expenditure. Applied retrospectively as a flat benchmark from Herda's sentence on 28 July 2016 to the 13 November 2022 report confirming that she was still in Ireland and her transfer had been approved, 2,299 days equals about 6.294 years, or approximately €623,604.

That figure is an illustration, not an audited bill for one prisoner. It deliberately excludes pre-sentence remand and the period between November 2022 and the actual 2023 transfer because the exact dates needed for a defensible calculation are incomplete. It also excludes Garda investigation, prosecution, courts, legal aid, appeals, transfer administration and the immeasurable human cost to the victim and his family. Irish prison-space costing must stop at transfer: imprisonment in Poland is not an Irish Prison Service space cost.

What the published record does—and does not—show

The reviewed judgments and case reports do not specify any previous conviction. That is not the same as proof that none existed, so this page makes no such claim. Nor does the record support attaching asylum, illegal-immigration or deportation claims to Herda. What it does establish is stark enough: a Polish national who came to Ireland as a young adult was convicted of deliberately killing a man who could not swim, received the mandatory life sentence, lost both appellate routes and was eventually transferred to her home country to continue that sentence.