Homicide detectives have charged a 38-year-old man with murder over the shooting death of WA father Shawn Dhu after police were called to a rural Keysbrook property.

Mr Dhu, 44, was found with a fatal gunshot wound on Saturday morning after tactical police rushed to Hilltop Orchard on Scarp Road following a triple-0 call about 8.40am.

Police said his partner and their son managed to “safely evacuate” to the safety of a neighbouring property before the alarm was raised.

A 38-year-old man from Mt Richon, who is known to Mr Dhu but was not family, was arrested nearby in a vehicle.

The 7NEWS helicopter filmed the 38-year-old curled up in the back of a police van after he was located by officers.

He was charged with one count of murder on Sunday following an investigation by the homicide squad.

He is due to appear in Armadale Magistrates Court on Monday.

Police said investigators had seized three firearms located at the property.

“These firearms remain the subject of ongoing investigations,” a spokesman said.

Det-Sen. Sgt. Stephen Cleal, of the homicide squad, said the 38-year-old man was not a licensed firearms holder during a press conference.

The murder charge comes after The West Australian revealed the identity of the alleged murder victim as Mr Dhu — a one-time aspiring politician and father.