Son of missing GP believes his mother is probably dead

Dr Nathalie Casal was last seen months ago.
Rachel Fieldhouse
Dr Nathalie Casal. Supplied.

Dr Nathalie Casal was last seen alive outside her home in the outer Perth suburb of Gnangara.

At the time her family understood she had decided to hike from Perth to Albany along the 1000km Bibbulmun Track with an organised group, and although she would be uncontactable for some time, she would return.