The 19-year-old man was walking from Gosnells to Kelmscott when he lost consciousness.
He regained consciousness at the bottom of a 5m- 7m deep well at an abandoned church on Railway Avenue in Kelmscott and had sustained serious injuries.
The victim was rescued by a man who then took him to Kelmscott Train station.
Detectives are looking to speak to the man in the photo as it is believed he may have more information about the incident to assist them with their investigation.
Anyone who recognises this man, or who knows of his whereabouts is asked to contact Crime Stoppers on 1800 333 000.