Homicide detectives are investigating the death of a one-year-old baby boy in Golden Bay.
Police attended a residence in Golden Bay on Sunday following the death.
It is understood the same baby was allegedly assaulted in Narrogin in October last year.
The then six-week-old was taken to Narrogin Regional Hospital before being transferred to Princess Margaret Hospital.
He was later released.
A 25-year-old man from Mandurah was charged with grievous bodily harm over the alleged attack.
The investigation into the boy's death is ongoing.
Kwinana Recquatic's swim school recognised nationally
Rockingham Police: Locals advised not to approach wanted man
Concerns for missing girl
Peel Thunder cruise into 2026 WAFL grand final
Two teens cautioned, one charged over brutal Falcon attack
Nearly 100 new rentals to be built in Mandurah
Blue swimmer crabs off limits during season closure
Fire crews on scene of Meadow Springs house fire
Perth's southern suburbs declared One Nation's 'heartland' after Secret Harbour by-election victory