UPDATE: Glenn Ferguson has been found. It's understood he has been taken to hospital.
Mandurah Police are seeking the public's assistance to locate Glenn Daniel Ferguson.
The 44-year-old is known to frequent the Halls Head area of Mandurah.
He is described as 180 cm tall, slim build with blonde hair and blue eyes.
Anyone with information on his current whereabouts is asked to contact police on 131 444 (Ref 217427).