An ex-soldier turned gun-for-hire who shot dead a bikie boss, allegedly at the request of an underworld rival, was investigated for terrorism offences, a court has been told.

The ex-army reservist, who cannot be named for legal reasons, gunned down senior Rebels bikie Nick Martin at Perth Motorplex on December 12, 2020 in a sniper-style attack.

The convicted murderer returned to the witness box on Friday at the trial of David James Pye, 43, who allegedly paid the killer $100,000 for the hit at the racetrack.

Pye’s barrister, David Hallowes SC, attacked the 39-year-old’s honesty during his cross-examination as he took him through recorded conversations and statements from before and after the killing.

One of those included a message the sniper sent a former teacher a month before he kil

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