Hydrogen cyanide
The barracks was the scene of a sensational murder on 27 December 1873, when the body of Gunner Colin Donaldson was found slumped across the bed of Anne Wyndford Marshall, in the apartment she shared with her husband. He had been poisoned with Hydrogen cyanide, which Mrs. Marshall had purchased in Rathmines a few days previously. The inquest on 8 January 1874 heard that Donaldson and Marshall had had disagreements on several occasions but ended up on good terms. Although the evidence was stacked against her, at her trial on 10 February the jury found Mrs. Marshall not guilty.