Queensland police say they discovered multiple weapons during the search of a vehicle and home after alleged murderer Stafford Emmerson was arrested south of Brisbane.
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The 40-year-old was arrested in the Logan suburb of Regents Park without incident on Saturday before he and a witness were taken into custody over the death of Megan Kirley, who was shot dead at her partner's home in Brisbane's south last month.
Mr Emmerson was known to police prior to Ms Kirley's death at Karawatha and has since been charged with the murder.
Detective Inspector Craig Morrow said the accused was interviewed on Saturday night and would face court on Monday charged with murder.
"At this stage, we can't determine if there is an actual link between Stafford Emmerson and the deceased," he said.
He said there was also no link to Ms Kirley's partner, who called police for help the night she was killed.
"We have no known link between him and either of those two people," he said.
The witness was interviewed into the night but not charged.
Inspector Morrow said the weapons were found when police searched a vehicle and an unspecified house.
"There is testing ongoing in regards to those weapons to determine if they're linked to that offence," he said.
Inspector Morrow would not detail a motive for the alleged murder or say whether it was a random attack.
"We will reveal this brief of events to the court ... we're not completely finished with this investigation yet," he said.
"There’s still a number of areas we still need to investigate (to) bring together a full brief (of evidence) and that will form part of that."
Inspector Morrow said he believed Ms Kirley, 40, was shot in the head by a .22 calibre weapon, which a police spokesperson described as a long-arm rifle.
Early police investigations centred on two cars seen driving past the Wembley Road crime scene and police were continuing to make a range of further inquiries.
"If those inquiries identify that there may be other persons involved then we'll look at that," he said.
"But at this stage what I can say is that all the people that were in those vehicles on the night in question have been spoken to.
"There's no other person that we’re unaware of."
Ms Kirley's partner, Pieter Pickering, found her lifeless body on February 9. Inspector Morrow said the man called triple zero, had continued to assist police with enquiries and was not a person of interest.
The inspector said police worked tirelessly to make an arrest but the community contribution had significantly helped the investigation.
“Ever since day one, we’ve had a flood of information come in into certain aspects of our investigation right through to when we released the footage of the two cars," he said.
"It was public assistance that gave us a link in regards to those two cars and again leading into his location yesterday."
Inspector Morrow said the Karawatha case presented many challenges for detectives, especially being a semi-rural property.
“It poses a number of challenges, not knowing who else may have been there," he said.
"You have one version and one version only from a witness."
Inspector Morrow said Ms Kirley's family was notified a murder charge had been laid.
"They’re very pleased to have some closure on this," he said.
Mr Emmerson is due to front the Brisbane Magistrates Court on Monday.
- With AAP
Correction: An earlier version of this article stated the weapons were found at Mr Emmerson's home. Inspector Morrow did not specify the location of the house or the car where they were found.
