09:50 EDT, 15 March 2021 107 shares An adrenaline junkie with military experience in Iraq has been arrested over the assassination of a notorious bikie leader who was shot dead by a sniper. Former Rebels bikie boss Nick Martin, 51, was shot in the back at the Outlaw Nitro Challenge drag racing event at the Perth Motorplex, Kwinana Beach at 8.30pm on Saturday, December 12. He died at the scene in front of horrified families and children including his own wife and step-daughter. Police raided a home in Waikiki and bushland in Warnbro, in Perth's southern suburbs, on Monday before taking the man into custody. Nick Martin (pictured) was shot in the back at the Perth Motorplex on December 12 in front of horrified families who were trying to watch the nitro cars high-octane drag racing