Gable Tostee has reached out to the family of Warriena Wright to express his sympathy after he was acquitted of murdering the New Zealand tourist.
Defence lawyer Nick Dore says Mr Tostee had wanted to communicate with Ms Wright's family since before his Supreme Court trial but had been instructed not to.
The 30-year-old carpet layer was found not guilty of killing the 26-year-old who fell from the 14th floor balcony of his Gold Coast apartment in August 2014.
Mr Dore said he advised him not to make any approach to Ms Wright's family until now and if the family accepted their offer, then it would be done behind closed doors.
"He wanted to show an expression of sympathy - yes. I advised him not to. I'll fall on my sword for that," Mr Dore said on Friday.
"Representations have been made in relation to that. If it were to occur, it would occur in a private setting."
Mr Tostee recorded his encounter with Ms Wright and the entire 139-minute audio recording was played to the jury during the six-day trial.
It included a confrontation between Mr Tostee and Ms Wright that led to her being locked out on the balcony and falling to her death while trying to climb down.
Mr Dore said he had never asked Mr Tostee why he pushed the record button on his mobile phone, but it was the difference between innocence and guilt.
"It definitely saved him and made it a completely different trial," he said.
Mr Dore said Mr Tostee may have appeared emotionless in public during the trial but behind closed doors, he was "frustrated" and "scared".
He said he was compliant and always took instructions.
"Gable was a client that took advice. He didn't argue, he wasn't intimidating ... he was someone who sat there and took advice, and let lawyers do what they do without interruption."
Ms Wright and Mr Tostee used matchmaking app Tinder and soon after meeting, they headed back to his apartment.
Mr Dore had a word of advice for Mr Tostee and anyone using the dating app.
"I'd probably advise him not. I'd probably advise everybody to stay off Tinder."
Ms Wright's death has now been referred to Queensland's coroner, who may choose to hold an inquest into the matter.
Meantime, there have been calls for Queensland authorities to restrict jury members' access to mobile phones after one juror almost caused a mistrial in the case by posting about it on Instagram.