The assassin who murdered a former bikie boss in a sniper-style attack at a suburban speedway has told a Perth court he had killed people in targeted assassinations before.

The man is the star witness for the prosecution in the high-profile trial of David James Pye, who is accused of orchestrating the public killing of rival bikie Nick Martin at the Kwinana Motorplex in December 2020.

It is alleged Mr Pye hired the assassin, who is serving a 20-year jail sentence for Mr Martin's murder and can't be identified.

The assassin told the WA Supreme Court he had told Mr Pye and his partner that he did not know how many people he may have killed, while a secretly-recorded conversation also captured him telling them about the first time he had killed a person.

The man completed his time in the

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