Homicide Squad detectives are investigating the death of a 49-year-old man at a home in Perth's southern suburbs.

Police were called to an incident on Bramall Terrace in Baldivis just before 7pm on Tuesday where they found a critically wounded man.

He was taken to hospital where he later died.

A 45-year-old woman who police say is known to the man is assisting with the investigation, but has not been charged with a crime.

Neighbours shocked

One nearby resident, Kulnoor Breed Singh, spoke of hearing a loud commotion from outside.

"I heard a loud sound of police sirens so I just ran out from my house, and I saw like four to six police cars, and there was just a crowd near my house," he said.

"We were shocked, like 'what's going on?'.

"It's quite worrying in our neighbourhood ... it's

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