For more than two hours during a police interview, Brisbane financial adviser Trung The Ma maintained he had a normal client relationship with Huegio Bonham.
That was until he was asked why his car was parked in Mr Bonham's Gold Coast driveway on February 3, 2014.
"I'm in big trouble," Ma muttered in the interview played to a Brisbane Supreme Court jury on Wednesday.
Ma would later confess to bludgeoning the 63-year-old Mr Bonham to death with a hammer and hiding his body in storage after their business relationship soured.
But he has pleaded not guilty to murder on mental health grounds.
His defence lawyer argues his responsibility for killing Mr Bonham was diminished because his state of mind was altered over fears of the collapse of his business and damage to his reputation and family.
But prosecutors rejected his guilty plea to the lesser charge of manslaughter, saying Mr Bonham found he could not access money being managed by Ma after buying a house in the Gold Coast hinterland to set up a wellness program.
They allege Ma murdered Mr Bonham, a spiritual healer, because it would be discovered he was defrauding him of $700,000.
As well as hiding the body, Ma attempted to cover up Mr Bonham's death by telling colleagues and police he was in meetings at the time of the killing.
But police had evidence to the contrary.
Footage showed Ma buying two large plastic containers from Bunnings around the time of the alleged murder on February 3.
While disposing of Mr Bonham's belongings, his wallet was left on a skip bin at Indooroopilly shopping centre, where Ma had an office, before being handed in to the information desk.
When someone claiming to be Mr Bonham called up looking for it, Ma turned up six minutes later to collect it, information desk staffer Daniele Martufi testified on Wednesday.
And when police asked him in the interview two weeks later why his black Subaru was at Mr Bonham's house on February 3, Ma said nothing for more than a minute.
Eventually, he claimed Mr Bonham sent him an email saying he wanted to leave him as a financial adviser.
"I went to his house to confront him about it," Ma said.
Ma, 35, wept in court when watching himself in the interview talk about his daughter.
The trial continues.