The airline pilot is accused of killing Mr Hill, 74, and Mrs Clay, 73, in the Wonnangatta Valley, in Victoria's northeast, in March 2020.
It's alleged he then disposed of their bodies in bushland before going back months later to burn his remains.
Lynn's barrister Dermot Dann confirmed the 57-year-old would be the only witness called for the defence case.
Lynn will give evidence a Supreme Court jury on Thursday morning.
In his record of interview, Lynn set out his version of events, telling officers Mrs Clay was accidentally shot in the head as he and Mr Hill tussled over his shotgun.
Mr Hill had taken Lynn's gun and was threatening to show police drone footage of the pilot hunting deer near their campsite, Lynn told the officers.
He claimed after Mrs Clay was shot, Mr Hill came at him with a knife and was stabbed in the chest in the ensuing struggle.
Lynn told police once he realised they were both dead, he used his experience as an airline pilot to formulate a plan to "save" himself.
That included moving the bodies to the remote bushland of the Union Spur track and then going back in November 2020 to burn the remains.
"I realised it was unravelling," Lynn told officers in his record of interview.
"I realised I had to go back ... I had to wait for the (COVID-19) lockdowns to finish and the roads to open up, and I steeled myself for the task."
He admitted he vomited several times as the bodies burned, saying the smell and the memories were confronting.
At the end of the police interview, Lynn remained emotionless as he was told he would be charged with the murders of Mr Hill and Mrs Clay.
When asked if he had anything to say, he told police he was innocent of murder.
"I haven't behaved well," he said.
"I've made some poor decisions but murder, as I understand it, I'm innocent of."
The trial continues.
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