Sergeant 1st Class William Watson RILEY
Sergeant 3rd Class Maurice Raymond McDIARMID
30 September, 1971
On 30 September, 1971, Sergeant 2nd Class Riley and Senior Constable McDiarmid attended a dwelling in Mimosa Avenue, Toongabbie to investigate a report that a man had shot and killed his brother at that address. On arrival the police saw the offender Clarke who quickly ran to the rear of the house. Senior Constable McDiarmid followed him while the sergeant entered through the front door. As the senior constable entered through the back door the offender opened fire with a shotgun, inflicting a fatal wound. It appears the offender then went back through the house where he also shot and killed Sergeant Riley. Although the senior constable was still alive when other police arrived he died a short time later in an ambulance on the way to hospital. The offender was shot and killed by police the same day.
William Riley was born in 1921 and joined the New South Wales Police Force on 3 December, 1945. At the time of his death he was stationed at Blacktown. He was posthumously promoted to Sergeant 1st Class.
Maurice McDiarmid was born in 1932 and joined the New South Wales Police Force on 9 July, 1956. At the time of his death he was stationed at Blacktown. He was posthumously promoted to Sergeant 3rd Class.