South Australia Police are investigating the theft of a bronze plaque from the memorial for a fallen police officer at Leabrook.
The plaque had been fixed to a rock in the Constable Hyde Memorial Garden, Tusmore Avenue, Leabrook.
The plaque and garden commemorate the murder of Constable William Hyde, 36, who was shot in the head while foiling a robbery at Marryatville on 2 January 1909. His killers were never apprehended.
Police say the theft of the plaque was first noticed last Wednesday and may have occurred sometime in the previous week.
Anyone with information on the theft or whereabouts of the stolen plaque is urged to contact Crime Stoppers on 1800 333 000 or online at www.crimestopperssa.com.au