Third man arrested over fatal Brisbane stabbing, one still on the run

A third man has been arrested over the alleged fatal stabbing of 23-year-old Levi Johnson outside a Brisbane gym on Monday.

Queensland Police say 35-year-old Thomas Myler had allegedly been on the run since Johnson was killed on Monday in broad daylight outside a gym park in Mansfield.

Detective Superintendent Andrew Massingham said a member of the public reported seeing the car used in the "horrific" attack on Johnson which led police to Myler's whereabouts.

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Levi Johnston, 23, was dragged out of his car in what police called a "disturbing and brazen" ambush at a carpark outside a gym in Mansfield.

He added Myler and his girlfriend were at a Chandler residence allegedly attempting to bury firearms.

Myler's girlfriend is currently undergoing questioning and police are deciding whether to lay any charges in relation to aiding Myler in avoiding police custody.

Police also located a white Nissan Patrol believed to have been used in Monday's attack.

Police are searching for Kyle Martin who allegedly was involved in the fatal stabbing of a 23-year-old man in Mansfield.

Officers are still searching for 24-year-old Kyle Martin for the offence of murder, with the circumstance of aggravation that he and Myler were members of a criminal organisation at the time.

"We have updated images of him, there is some clear CCTV footage that we released earlier tonight, once again we call on the public for assistance he is potentially armed and dangerous as I suspected today," Massingham said.

Martin was captured on CCTV footage running through the busy Carindale shopping centre just before the attack.

Massingham said Myler was armed prior to surrendering to police.

Police believe Myler and Martin split up after the alleged attack and have stayed on the run locally instead of fleeing across the border.

Massingham also added the relationship between the two men seemed "fractured".

"It would appear from some words spoken by this man that relationship was somewhat fractured," he said.

Kyle Martin captured on CCTV after the alleged fatal stabbing of Levi Johnson at Mansfield.

Earlier this week two other men, both aged 34, were charged with murder and related offences over the killing.

Massingham said it was believed the men could all be linked to the "fairly unknown" 13 Kings gang, which has a presence in Capalaba.

He said police believed the men had been watching the victim before he was attacked on Monday.

He said detectives believed the victim realised he was being followed and pulled into the car park of a Mansfield gym to seek refuge when he was allegedly attacked about 1pm on Monday.

The victim was allegedly pursued by a black Audi and rammed by a Nissan Patrol before five men piled out of the cars and smashed the driver's side window with a crowbar.

Police say they chased the victim as he tried to flee from the passenger door, and that he was stabbed multiple times in the torso by one of the men before four of the men fled in the Nissan Patrol.

The fifth man fled on foot.

Superintendent Massingham said police had not found the Nissan Patrol, which they believed was still in the area.