WA Police believe a ute that ploughed into a van in West Perth on Monday, killing an Australia Post employee, could have collided with another car before the fatal crash.

In a new statement on Thursday, WA Police said they believed the Isuzu D Max may have been in involved in an earlier collision with a Suzuki Vitara.

No injuries were reported from the earlier crash.

The suspected collision came before the ute crashed into a van on Hay Street around 7am on Monday with the force of the impact sending both vehicles into an office building.

Australia Post worker and much-loved grandmother Theena Barton was delivering mail when the crash happened.

The 74-year-old was critically injured and died at the scene.

Investigators are urging anyone who travelled on Kwinana Freeway northbound from

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