Updated

Australian officials said Thursday they would deport an American convicted in the death of his wife on a scuba-diving honeymoon after U.S. officials pledged not to seek the death penalty if he is convicted again at home.

Gabe Watson was released from prison last week after serving an 18-month sentence for the manslaughter of his wife, Tina, in 2003 during a trip on Australia's Great Barrier Reef. He was being held in immigration custody until Australia — a staunch opponent of the death penalty — received assurances that he would not face capital charges in his home state of Alabama.

Prosecutors in Alabama, a pro-death penalty state, want to try Watson again over his wife's death, and are expected to seek murder charges.

An immigration spokeswoman, speaking on condition of anonymity because of department policy, said the Australian government had received assurances from U.S. officials that "the death penalty would not be sought, imposed or carried out."

"We are now satisfied that our international obligations have been met and are commencing plans for Mr. Watson's removal," she said.

She would not give details on the timing of his deportation but said it would be "as soon as possible."

Later, department spokesman Sandi Logan said Watson and his lawyer would determine the timing of his return to the United States, which could be within 48 hours. Watson will be accompanied by two security guards on a commercial flight.

Adrian Braithwaite, Watson's Brisbane-based lawyer, said the Australian government had refused to show him a copy of the U.S. assurance because it was a diplomatic document, but he had renewed his request to see it.

"At the moment I'm not taking the word of the government that they have received the assurances," Braithwaite told The Associated Press by telephone. "I want to be provided with a copy of the correspondence received from the United States so that we can be satisfied it's a binding assurance and properly advise our client."

He said Watson was ready for whatever may happen upon his return to the United States.

"He's not running scared from what might occur in Alabama," Braithwaite said.

Watson was dubbed the "Honeymoon Killer" by the Australian media after his wife of 11 days, 26-year-old Tina Watson, drowned during a 2003 scuba diving trip.

In 2008, nearly five years after Tina drowned, the Queensland state coroner found there was sufficient evidence to charge Watson with her death, and he was officially charged with murder a few months later.

In 2009, Watson — who had remarried — traveled to Australia to face trial.

Officials in Queensland state initially charged him with murder, arguing he killed his wife by turning off her air supply and holding her underwater. When Watson pleaded guilty to the lesser manslaughter charge last year, he was sentenced to 18 months — a punishment Tina Watson's family and Alabama authorities slammed as far too lenient.

Queensland Coroner David Glasgow said a possible motive for the killing was Tina Watson's modest life insurance policy.

Alabama Attorney General Troy King has said he believes Watson devised a plot in Alabama to kill his wife on their honeymoon, which would give the U.S. state jurisdiction to charge him. King has argued there are no international standards on double jeopardy that prevent Alabama from trying Watson again over the death.

Last month, a grand jury met in Birmingham, Alabama, to decide whether to indict Watson in his wife's death. It is unclear what the outcome of that session was because prosecutors haven't said and indictments in Alabama are not considered public record until a suspect has been arrested.

Under Australia's Extradition Act, a person cannot be deported to face prosecution on a capital charge unless there is an assurance the death penalty will not be imposed.