In the crosshairs of a sniper: The chilling view police believe a fly-in-fly-out killer could have had before pulling the trigger to execute a bikie boss at a drag race - as crowds return for the first time since the assassination

The chilling vantage point a fly-in-fly-out sniper may have used to take out a bikie kingpin has emerged - as the Perth racetrack where he was gunned down welcomed back crowds for the first time since the shooting.

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.

Martin told his wife Amanda: 'babe, I've been shot' as she tried to give him CPR while he died in her arms.

The spot on the racecourse where the sniper may have laid in wait for Martin is only metres away from the one police are investigating as the gunman's possible position. 

Crowds meanwhile returned to the popular Perth Motorplex on Saturday for the first time since the public shooting that shocked the nation.

Revealed: The possible position where the sniper who executed Rebels bikie boss Nick Martin may have been shooting from. The spot is located not far from where police are investigating

Nick Martin 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

The chaos at the racetrack on December 12 in Perth after Martin was executed is pictured

More than 150 teams participated in the 2021 Nitro Slam including Nitro Funny Cars and Burning Dragsters, bringing high-octane excitement back to Kwinana Beach.

Security was tight with entrants randomly scanned with metal detectors.

Police and security guards patrolled the crowds but no violence was reported.

WA Police have not revealed any new leads since the public execution despite several arrests and raids immediately following the shooting. 

Police have posted a $1 million reward for information but have not yet said if they have identified any suspects in the gangland killing. 

A photograph taken on the opposite side of the racing lanes from where Martin was sitting with his family, on the edge of a grandstand, shows a clear line of sight to the target.

One of the possible shooter locations previously identified at the Perth Motorplex. A long shot would indicate a sniper, experts say

Another man, convicted drug dealer Ricky Chapman, was injured in the shooting at the Kwinana raceway, south of Perth.

Police said the same bullet that killed Martin had passed through to hurt Chapman - and a bullet fragment was recovered from his arm.  

Queensland University of Technology associate professor of criminology Mark Lauchs, an expert on outlaw motorcycle gangs said if the shot was taken from a distance then it was likely by a professional sniper as bikies don't typically have great marksmanship skills.

Martin died in the arms of his wife Amanda as she tried to give him CPR. His last words were: 'babe, I've been shot'

'If it's from a long way away, I would assume it's not bikie related as that's not how bikies do things,' he told Daily Mail Australia last month.

'It may be associated with things other than a bikie war.'

Professor Lauchs said a deliberate execution of this type would be more likely to do with organised crime than an inter-club bikie war or an internal club dispute.

Police are so far tight-lipped about whether they have identified any suspects in the public execution of Nick Martin   

WA Police are reportedly trying to work out whether the sniper shot the bikie from an area close to bushland on the edge of the motor complex.

It is thought that surveillance cameras at the complex might yield some clues to the public killing that shocked the nation, with a toilet block 20 metres from where Martin was sitting thought to be the most valuable.

Media speculation has offered up many possible theories such as that a fly-in foreign professional might have been used for the hit, or that the killer may have used a spotter close to Nick Martin to keep him informed of his target's movements. 

Mr Lauchs told Daily Mail Australia that bikies were more direct, preferring brute force and open violence such as drive-by shootings and bashings to settle inter-club bikie war or internal club disputes. 

He said a deliberate execution of this type would be more likely to do with organised crime.

Rebels bikie Nick Martin was riden in to Pinnaroo Cemetery in a coffin covered in pictures of $100 bills at his extravagant bikie funeral on December 23

Pictured: Rebels bikies embrace at the funeral of Nick Martin in Perth on December 23

A $1 million reward has been offered for information leading to the arrest of the shooter who killed Nick Martin, 51, (pictured with wife Amanda)

Big outlaw motorcycle clubs often had individuals within them involved with organised crime even when the club itself was not an organised criminal group, he said.  

Hundreds of mourners gathered on December 23 to farewell the former Rebels president at his Pinnaroo Valley Memorial Park funeral - the majority turning up in patched Rebels colours.

Martin's coffin was covered in pictures of $100 bills and Bob Dylan's All Along the Watchtower played as bikies took turns to walk up and touch it as it was brought in under a marquee for the service.

The public were shocked by the brazen execution which happened right in front of families. Pictured: the scene on the night of the shooting

More than 200 bikies from the Rebels and other clubs attended Martin's funeral

The public execution sparked fears of an bikie war, and WA Police launched Taskforce Ravello to find the killer.

Bikie compounds and properties were raided across Perth in December but no leads have been made public.   

A five-year-old child also suffered a minor injury in the shooting.

WA Police Assistant Commissioner Brad Royce said in December there had been a 'fantastic response' to a Crime Stoppers appeal for information about the murder  with anonymity guaranteed.

'Whilst you might think at this stage you're in the clear, there's a lot of people who know what you've done,' he said.

'They'll be close to you, they'll be looking at the reward, they'll be looking at the pressure on their lives, they'll be looking at the threat to their families and what may happen, and it's highly likely they will talk.'