Mr Walker, 76, was final seen on Morning Avenue in Maryborough on the afternoon of Valentine’s Day.
Police launched an in depth air, land and water search over the weekend, zoning in on sections of the Mary River.
A physique was found alongside a financial institution of the river about 4.30pm on Wednesday.
“Formal forensic identification processes are now underway, and police have spoken with the mans family,” police stated in a press release Thursday afternoon.
“There are no suspicious circumstances and a report will be prepared for the coroner.”