Bio

Henry McCabe was born in 1877 in Ireland. By the 1920s, he was living in the Dublin area with his wife and children and worked as a gardener. McCabe was employed by the wealthy McDonnell family at their large seaside residence, La Mancha, in Malahide. The household was known locally because of its size, privacy, and the unusual lifestyle of its unmarried occupants. McCabe was considered a working-class laborer with modest means and depended on domestic employment to support his family.

In 1926, rumors reportedly circulated that the McDonnell house might be sold. Prosecutors later argued that McCabe feared losing his job if that happened. Whether this was the true motive was debated, but it became central to the case that followed.

Murder Story

On the morning of March 31, 1926, Henry McCabe alerted authorities that La Mancha, the McDonnell family home in Malahide, was on fire. When police and neighbors entered the property, they discovered a scene of mass death. Inside the burning house were the bodies of six people: brothers Peter and Joseph McDonnell, their sisters Annie and Alice, and two servants, James Clarke and Mary McGowan.

Investigators quickly determined that the blaze had been deliberately set. Several victims showed signs of severe head injuries, and later examinations suggested arsenic may also have been used. Authorities concluded that the fire was intended to destroy evidence after the killings.

Suspicion focused on McCabe almost immediately. He was the only regular member of the household to survive, and investigators believed physical evidence connected him to the crime. During the trial, prosecutors claimed he killed the family and staff for robbery or because he feared losing his employment if the property was sold.

McCabe denied responsibility and maintained that he had been wrongly accused. His case became one of the most controversial murder trials in early independent Ireland because of unanswered questions, disputed evidence, and uncertainty over motive.

A jury convicted him in November 1926 after less than an hour of deliberation. His appeal failed, and on December 9, 1926, Henry McCabe was hanged at Mountjoy Prison in Dublin. The murders at La Mancha remain one of Ireland’s most infamous unsolved or disputed criminal cases.