Hamilton Police are asking for the public's assistance in locating 76-year-old Dianne Cosgrove, who was reported missing on Wednesday, July 8, 2026.

Dianne was last seen leaving her Ancaster residence sometime overnight or in the early morning hours. She is living with Alzheimer's disease, and police are concerned for her wellbeing.

Dianne is described as:

• White female
• 5'0" (152 cm)
• Approximately 130 lbs (59 kg)
• Shoulder-length brown hair

A clothing description is not available.

Dianne is believed to be driving a black Dodge Journey bearing Ontario licence plate CKKN 178.

Police have conducted several investigative checks to locate Dianne; however, she and the vehicle have not yet been found.

Anyone who sees Dianne or the vehicle is asked not to approach her. Instead, call 911 immediately and provide her location. Anyone with information about her whereabouts is asked to contact the Hamilton Police Service Division 30 Staff Sergeant at 905-546-3886.

Hamilton Police thank the public for their assistance in helping bring Dianne home safely.