Credit, however, must go to the police who never gave up and knew eventually they'd get their man.
Despite police knowing Hallett had confessed to his estranged wife Susan Sharpe just hours after the killing, Hallett walked free from court, the Crown unable to use the crucial evidence.
One of the people I tip my hat to is Detective Inspector Mark Loper who was instrumental in helping to eventually bring Hallett to justice.
His sheer doggedness and determination are admirable qualities and obviously crucial when it comes to policing.
There were emotional scenes outside the court after the verdict and one person amidst that was Mr Loper.
He and a long line of police have worked tirelessly to bring closure for the Tahu family who have had to wait 33 years, eight months and 14 days for an outcome.
The family showed that appreciation as one by one they hugged Mr Loper outside of the court.