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Burlington’s Helen Robertson has been missing since July but her wallet was just found on Monday.

Maintenance crews found the brown leather Fossil wallet lying on the football field at Burlington’s Norton Park.

Robertson went missing from her Millcroft Park home last July and suffers from Alzheimers. Despite extensive searches weeks after her disappearance police have been no closer to finding her and this is the first big clue for investigators.

Police believe the wallet was discarded sometime between April 21 and April 24 because the football field is maintained after every game.

Officers were out in the area doing a ground search Monday. The wallet had Robertson’s ID in it but police would not say if any other items were missing. Police are urging the person who found the wallet to come forward.

Police say they still don’t know how the wallet ended up there and they are looking at multiple theories. One theory is that rising water levels from the recent rainfall could have washed her wallet out into the open where someone may have found it and tossed it onto the field.

Anyone with information about the wallet or Robertson’s whereabouts is asked to contact Halton police or Crimestoppers.