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.
Digital drivers' licences to be introduced in WA
Mandurah FIFO worker wins $250k
2026 ANZAC Day services across the Peel and Rockingham regions
Mother of 11-year-old boy killed in Mandurah scooter crash found safe and well
Peel charity desperately seeks funds to keep doors open
Australind train service set to resume
Thunder premiership player Traye Bennell hangs up the boots
Works underway to protect 200-year-old 'Big Tree' in Greenfields
Wanted man believed to be in Mandurah area