In an update released on Tuesday, police said Mr Martin suffered a puncture wound to his chest shortly before the crash and the exact cause of the wound should be known later in the day.
On Monday, Comanchero member Shane Ross, 36, was found dead in bushland on the corner of the Pacific Highway and Tallebudgera Creek Road in Tallebudgera.
The body of Mr Ross, who was also the founder of Monstr Clothing, was found by one of his friends who was out looking for him about 1.30pm. The victim had been shot in the head.
Mr Ross and Mr Martin have been described by detectives as “business partners and friends” and were drinking together at a Pimpama tavern about 7pm on Friday – two hours before the fatal crash.
Detective Superintendent Kerry Johnson said the two victims were drinking with two other people, who police spoken to, until about 7.30pm when the group all left the premises.
Police said the victims left in a dark-coloured car, but two hours later Mr Martin was instead driving his white Mercedes before fatally crashing into a tree.
Superintendent Johnson said some kind of meeting took place at the bushland area where Mr Ross was found dead and detectives were trying to gather more information about the people involved.
It is not known whether the meeting took place before or after Mr Martin died in the crash or whether Mr Martin witnessed Mr Ross’ death, but police suspect the deaths are connected.
“It is being treated as a double-murder investigation,” Superintendent Johnson said on Tuesday.
Police divers were searching the nearby Tallebudgera Creek on Tuesday for evidence or a weapon.
Acting Superintendent Brendan Smith said the general public were not believed to be at risk.
“It’s not a crime of opportunity, these people are known to each other and the nature of their lifestyle has probably put them at greater risk than other people,” he said on Monday.
Detectives were still working out the circumstances of both deaths but confirmed Mr Ross’s death would be treated as a homicide.
Acting Superintendent Smith said investigators were trying to establish a motive and were probing Mr Ross’s underworld links.
“It would be coincidental if both incidents aren’t connected,” he said.
“The bikie lifestyle carries its own risk. Anyone who thinks a bikie is a motorcycle enthusiast is kidding themselves, they are criminals and criminal behaviour has risks.”
There is no suggestion Mr Martin was a bikie gang member, but he was known to police.
Police said motorists reported seeing an injured man walking along the side of Tallebudgera Creek Road close to the time of Friday’s crash in which Mr Martin died.
Investigators believe the injured person was neither Mr Martin nor Mr Ross and said it would be “an amazing coincidence” if the injured person was not somehow connected to the two men.
Detectives have appealed for witnesses or anyone with dashcam footage of Tallebudgera Creek Road from 9-10pm last Friday, October 18, to come forward or contact Crime Stoppers on 1800 333 000.
– with AAP
Toby Crockford is a breaking news reporter at the Brisbane Times