Evidence presented at the trial included Watson's differing accounts of what had happened on that day, of the couple's diving experience (or lack thereof), and of Tina's life insurance.
[1] Despite an earlier diagnosis of paroxysmal supraventricular tachycardia (PSVT), Tina began diving lessons in January 2003, and earned her certification just before her wedding to Watson on 11 October 2003.
[5] Watson claimed the currents were stronger than they expected and that he responded to a signal from Tina to return to the dive rope, where he noted a look of worry on her face before she accidentally knocked his mask and air regulator loose.
[6] Other divers nearby at the time, including Stanley Stutz, saw Watson engaged in an underwater "bear hug" with his "flailing" wife, after which he headed for the surface while Tina fell to the ocean floor.
[7] Watson climbed aboard the Spoilsport and alerted dive instructor Wade Singleton, who brought Tina to the surface after ten minutes underwater.
[10] In March 2005, Watson launched legal action in Alabama's Jefferson County Circuit Court to recoup the cost of the couple's trip after the travel insurance company refused a payout.
He was seeking $45,000 for the accidental death plus compensation for trip interruption, medical expenses, phone calls, taxi fares, fees for extra credit card statements and unspecified punitive damages for mental and emotional anguish.
The action was dismissed in May 2008 at Watson's request on the grounds the Australian investigation into his wife's death caused him "to reasonably apprehend that he risks self-incrimination in this case".
[11] His Australian legal team believed "it was not in his best interest" to pursue the damages claim and his U.S.-based lawyer, Bob Austin, added that his client would not be voluntarily "going back to Australia.
Watson did not inflate Tina's buoyancy control device (BCD) or remove her weight belt, and had failed to fulfill his obligations as her "dive buddy" by not sharing his alternative air source.
[16] The Queensland Director of Public Prosecutions, Tony Moynihan SC, issued a statement, which said: "The decision to accept Mr Watson's plea of guilty to manslaughter was made after a careful and thorough examination of the admissible evidence, and was not taken lightly.
The defence argued that Watson had had a momentary lapse in judgment, had been accused of a crime he did not commit, and had voluntarily returned to Australia to co-operate with the court, and that the penalty imposed by the trial judge was fair and just.
[21] After being informed by her family that flowers and gifts were repeatedly being vandalized or disappearing from the grave site, even when chained down, police surveillance videos showed Watson removing them with bolt cutters and throwing them in trash cans.
In 2011, the Probate Court removed Watson as administrator of Tina's estate and appointed her father, who also requested that her school and college pictures and yearbooks be returned.
[24] In May 2010, King announced he had information not yet made public and wanted to try Watson for capital murder and kidnapping, asserting jurisdiction based on the theory that the alleged crime was planned in Alabama.
[25] King petitioned Australia for the evidence held by police, but was refused access until he gave an undertaking that the death penalty would not be imposed, as required under Australian law.
This condition has been strongly criticised by King and Don Valeska, chief of the Attorney General's violent crime division, who stated: "If an Australian woman was killed here, we would immediately send the evidence there.
Friends and family of Watson questioned whether he had any motive for the murder, noting that his affection for Tina had seemed genuine, there was no life insurance policy naming him as beneficiary, and he appeared to be emotionally devastated for an extended time following her death.
[33] Alabama prosecutors charged Watson with murder and kidnapping at the conclusion of his prison sentence in Australia after finding what they claimed was evidence he had plotted to kill his wife while still in the United States.
Revelations that Watson needed help to don his diving equipment that day underscored that he was a "dangerous amateur" who showed "a complete lack of courage" when he abandoned his wife.
The company later pleaded guilty to contravening safety standards (their code of conduct said both Watson and Tina must be supervised by at least a divemaster on the dive in question) and was fined $6,500, plus costs of $1,500.
Lifetime produced a made-for-TV movie, Fatal Honeymoon, based on the death of Tina Watson, starring Harvey Keitel, Billy Miller and Amber Clayton.