Controversial Liberal candidate for Braddon Adam Brooks is resigning, only a day after his election victory was confirmed.
It's the final bombshell following a campaign dogged by allegations Mr Brooks dated women interstate under a fake identity.
He's repeatedly denied the claims, but a Sydney woman has supplied video, images and a statutory declaration.
The former Mining Minister, who left Tasmania on Wednesday, called the Premier on Thursday night to inform him he's undertaking treatment for his mental health.
"He explained to me that he is currently very unwell but in a safe environment," Peter Gutwein said.
Queensland Police have also charged Mr Brooks with weapons and document offences.
"Information provided to police last week resulted in a search warrant on a Marine Parade address in Redcliffe on Wednesday night, where it will be alleged a handgun and false driver's licences were seized," a statement said.
"The 45-year-old man has been charged with one count each of unlawful possession of Category H weapon, unauthorised possession of explosives and dealing with identity documents."
Mr Brooks will front the Redcliffe Magistrates Court on Tuesday.
"Mr Brooks advised me that he is seeking legal advice and intends to defend himself against these new charges, however due to his state of health and the need to focus on his own personal circumstances, it is his intention not to take his seat in the Parliament and to forward his resignation to the Governor today," the Premier said.
Youngster Felix Ellis will return to Parliament on a recount.