Grangegorman killings

Sylvia Sheils and Mary Callinan were killed during the night of 6-7 March 1997 in sheltered accommodation at Orchard View, on the grounds of the former St Brendan's Hospital in Grangegorman, Dublin. Both women, aged 59 and 61, had lived in the community after earlier being patients at the psychiatric hospital. They were found the following morning by a fellow resident. Post-mortem examinations established that each woman had sustained multiple stab wounds and further mutilation; the state pathologist said the injuries were beyond his professional experience.

The investigation initially focused on Dean Lyons, a 24-year-old man with a heroin addiction who had been assessed in childhood as having a low IQ and whom experts later found to be highly suggestible. In July 1997, after gardai heard that he had spoken about the killings, he was questioned and, while experiencing withdrawal, admitted to the murders. His early account did not fit the evidence: he was wrong about the location, the number of victims, and the weapons used. His parents and brother told investigators that he was prone to inventing stories and confessing to things he had not done. Lyons was nevertheless charged and held on remand.

Shortly afterwards Mark Nash, then under investigation for the killing of Carl and Catherine Doyle in County Roscommon in August 1997, admitted to the Grangegorman killings and gave details that were not publicly known, before retracting his statement. With Lyons already charged, opinion within the force divided. By early 1998 investigators concluded that Lyons had no involvement, and the charges against him were withdrawn on 29 April 1998 after roughly nine months in custody. Lyons died in 2000, before his name was cleared through later inquiries. In 2005 the Garda Siochana apologised to his family, and a Commission of Investigation reported in 2006 that his false confession arose from personal vulnerabilities compounded by leading questions during interview.

Nash was convicted of the Roscommon murders in 1998 and sentenced to life imprisonment. Advances in DNA analysis in 2009 identified both victims' blood on a jacket linked to him, and he was charged with the Grangegorman killings that October. After a lengthy trial at the Central Criminal Court, he was found guilty of the murders of Sylvia Sheils and Mary Callinan and sentenced to life on 20 April 2015. The Court of Appeal upheld the conviction in 2018. The case is widely cited in Ireland as a significant miscarriage of justice for the wrongful charging of an innocent man.