Wednesday 28 October 2026Compiled from published reports. Every claim links to its source.

Ireland Crime

Every case followed from the first report to the sentence, or to where the reporting stopped.

Case No. 1187Murder, sexual assault · Co. Monaghan · 15 Dec 2001

Nun killer Kealen Herron reportedly granted short-term temporary releases from Arbour Hill prison

Sister Philomena Lyons, an Irish woman aged 68, was strangled with her own scarf and sexually assaulted on 15 December 2001 on the grounds of the Sacred Heart Convent in Ballybay, Monaghan, while waiting for a bus into Dublin. Kealen Herron, who was 19 at the time, admitted the killing while under caution and pleaded guilty to murder in 2003, receiving a mandatory life sentence. In August 2025, Herron, now 45, was spotted leaving Arbour Hill prison in Dublin, with a source saying he was enjoying short-term temporary releases. The Irish Prison Service and the Parole Board said they do not comment on individual cases.

  1. Reported
  2. Arrested
  3. Charged
  4. In court
  5. Verdict
  6. Sentenced
reportedhappened, not reportedlatest stagenot yet

Key facts

consolidated from all reports
What happened
  • Sister Philomena Lyons, an Irish woman aged 68, was strangled with her own scarf and sexually assaulted on 15 December 2001 on the grounds of the Sacred Heart Convent in Ballybay, Monaghan, while waiting for a bus into Dublin.
  • Her body was found at 5:05pm by a hedge inside the convent grounds, with bruising on her jaw and neck and her underwear and tights pulled down.
  • Herron, who was 19 at the time, admitted the killing while under caution, initially saying the sexual assault followed the strangulation and later claiming it came first.
Investigation
DNA belonging to Philomena was found on Herron's jeans.
In court
Herron pleaded guilty to murder and received a mandatory life sentence in 2003.
Other details
  • Herron was reportedly drinking the night before the murder.
  • Herron, now 45, had no previous convictions and was spotted leaving Arbour Hill prison in Dublin in August 2025, with a source saying he was enjoying short-term temporary releases.
  • The Irish Prison Service and the Parole Board said they do not comment on individual cases.
18 statements extracted from the articles
  • whatHerron was 19 at the time of the crime. (irishmirror.ie)
  • whatHerron was reportedly drinking the night before the murder. (irishmirror.ie)
  • whatSister Philomena Lyons was 68 and was waiting for a bus into Dublin for a friend's 100th birthday party. (irishmirror.ie)
  • whatHer body was found at 5.05pm by a hedge inside the convent grounds. (irishmirror.ie)
  • whatShe was dragged to the hedge area by her neck. (irishmirror.ie)
  • whatHer underwear and tights were pulled down and there was bruising on her jaw and neck. (irishmirror.ie)
  • whatThere was evidence of sexual assault. (irishmirror.ie)
  • whatSister Philomena Lyons was born in Mallow, Cork, and spent 35 years as a teacher in Monaghan. (irishmirror.ie)
  • whatHerron admitted to the killing while under caution. (irishmirror.ie)
  • whatHerron initially said he sexually assaulted Philomena after the strangulation, later claiming the assault came first. (irishmirror.ie)
  • whereThe crime occurred on the grounds of the Sacred Heart Convent in Ballybay. (irishmirror.ie)
  • whenThe murder took place on 15 December 2001. (irishmirror.ie)
  • weaponShe was strangled by her own scarf. (irishmirror.ie)
  • investigationDNA belonging to Philomena was found on Herron's jeans. (irishmirror.ie)
  • courtHerron pleaded guilty to the murder and received a mandatory life sentence in 2003. (irishmirror.ie)
  • otherHerron is now 45, had no previous convictions, and held jobs in a plant hire company, a meat plant and on a construction site. (irishmirror.ie)
  • otherHerron was spotted leaving Arbour Hill prison in Dublin and a source said he was enjoying short-term temporary releases. (irishmirror.ie)
  • otherThe Irish Prison Service and the Parole Board said they do not comment on individual cases. (irishmirror.ie)

The reporting

newest first
  1. 4 Aug2025
    Otheririshmirror.ie, follow-up
    Killer, 19, sexually assaulted nun, 68, before dumping body in convent hedge

    Reports that Herron is reportedly enjoying short-term temporary releases from Arbour Hill prison, nearly 24 years after his 2003 life sentence, and recounts the details of the 2001 murder of Sister Philomena Lyons.

    victim, Sister Philomena Lyons, 68, female, Irish, irishSister Philomena Lyonsconvicted, Kealen Herron, 45, male, named, irish (judged from name)Kealen Herron