Gable Tostee says he didn't check on Warriena Wright when she disappeared from his 14th-floor balcony because he didn't want it to look like he'd pushed her.
In an interview with Australian current affairs show 60 Minutes, the 30-year-old is questioned why he didn't check to see if she was OK.
"Instinctively I knew that if I ran out there and somebody saw me looking over the edge and she had actually fallen all the way, it would look like, you know, i-it would not look good.
"It would look like I had forced her over or something."
A promotional video for the paid tell-all interview played on Nine's Today was aired on Friday.
Journalist Liam Bartlett conducted the interview, also asking Tostee why he threw the Kiwi woman out on his balcony.
"Gable, regardless, you had control of her," he said.
"You're six foot three, she was five foot four. How far is it between the front door and the balcony door."
Tostee cuts him off, saying: "It was a lot, lot closer to the balcony door and it was wide open and it was the logical option at the time."
The interview will run at 8.30pm local time on Sunday on Australia's Channel Nine.
Prime, which screens 60 Minutes in New Zealand, is yet to confirm screentime here.
Tostee, a carpet layer, was cleared of both murder and manslaughter charges in the Queensland courts last month.
Wright died in August, 2014 following a Tinder date with Tostee on the Gold Coast, where she had been enjoying a holiday.
The pair drank and had sex, but the evening turned sour and they began fighting.
Wright climbed over the balcony in an apparent attempt to escape but plunged to her death.
A snippet of the 60 Minutes interview had been released earlier in the week, and revealed Tostee maintains he was trying to stop Wright from "attacking him".
"I don't know what else to do. I wanted it to stop," Tostee told Bartlett of the pair's altercation.
In an audio recording taken by Tostee, Wright can be heard yelling "no" more than 30 times, to which Tostee responds she was "certainly trying to make a lot of noise".
He has been criticised for his behaviour following Wright's death, as well as for accepting what is rumoured to be a six-figure sum for his 60 Minutes interview.
He did not call an ambulance when he discovered Wright had fallen from his apartment's balcony, instead ringing his dad before leaving to get a pizza.
Tostee told 60 Minutes he was "still traumatised" by what happened and tried to explain why he didn't call emergency services.
"What happened, had happened - there was nothing an ambulance could do," he said.
"Nobody's trained for a situation like this. It's like being hit by lightning.
"There's no right or wrong to proceed from there."
Channel Nine has also received criticism for paying for the interview.