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Ron D’Ercole was at Alexander Drive
Ron D'Ercole and police at the scene yesterday. Picture: Lee Griffith/The West Australian

The husband of a Dianella mother killed in a crash when a police car was chasing an allegedly stolen Audi watched yesterday as investigators did tests as part of their inquiry.

Ron D'Ercole was at Alexander Drive and Morley Avenue from 8am with major crash and internal affairs police investigating the crash on April 12 in which 50-year-old Sharon D'Ercole died.

The wrecked cars - a police gang crime squad Ford Territory and Mrs D'Ercole's Toyota Corolla - were taken to the scene and hoisted into several positions by crane.

Officers moved floral tributes before doing the tests but replaced them afterwards. They also did acceleration and braking tests using similar cars.

Mr D'Ercole did not comment but has raised concerns about being kept in the dark on developments in the case.

A gang crime squad constable has been charged with dangerous driving causing death and two men were charged over the Audi theft.

The case is expected to generate debate at the WA Police Union annual conference, which begins today.

Members want to ban pursuits until the State Government introduces laws to hold offenders responsible for anything criminal during a chase.

"Offender onus" laws exist in some US States where motorists who try to evade custody are liable for any damage, injury or loss of life after they refuse to stop.

Police have urged anyone who saw the crash to come forward, particularly the occupants of a blue sedan travelling south on Alexander Drive at or near the time of the crash.