Greek police suspect that Caroline Crouch's husband killed her after she found out he was using his helicopter to smuggle drugs for drug cartels.
Caroline, 20, was killed by pilot Babis Anagnostopoulos, 33, at their family home in Athens.
He has admitted ending the young ladys life before allegedly staging a burglary and killing their pet dog to death to cover up the crime.
Detectives are now scrutinising his finances after suspicions about how he managed to fund the couple's lavish lifestyle.
The pair had recently been on a luxury holiday to Dubai and bought a 147,000 euro home in Greece that officers believe may have been paid for through his involvement with drugs.
Police are now reportedly concerned that Caroline may have found out about her husband's activities and opposed them.
After lying to the police for weeks, Anagnostopoulos apologised for smothering his wife to death with a pillow, claiming he "lost his temper."
But he is likely to argue that his wife was "verbally and physically aggressive towards him".
If he manages to convince a jury that the killing was unplanned, he could see a life sentence reduced to just 15 years behind bars.