The last time Rick Olden saw his 15-year-old stepsister before she disappeared from a Sydney boarding house nearly eight years ago, he laid her unconscious body on a couch after she had been assaulted.
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Moments before, the long-term drug addict had found Katrina Bohnenkamp lying facedown on concrete outside the Strathfield house where she was last seen alive in October 2012, an inquest has heard.
Katrina had been moved around several foster carers and homes since she was a toddler.
Her father Maiko Bohnenkamp, a drug addict for more than three decades, was unable to look after her.
After the teen was placed in care home Guardian Youth Care, she would regularly leave at all hours of the night to visit her father at an address caseworkers failed to retrieve.
Senior counsel Philip Strickland played footage at the inquest on Tuesday which showed Olden being interviewed by detectives last February.
It was the first time he had mentioned the alleged assault to police.
In the video, Mr Olden describes hearing noises and seeing Katrina's father perched on the windowsill before walking outside to investigate.
"Maiko is standing behind her with a look on his face, the look was like 'what the f*** have I done?' I don't think he knew what he had done either .... she looked lifeless. It was scary," Mr Olden told police.
"What have you done? You've killed her," Mr Olden recalls telling her father who allegedly responded: "I had to hit her."
Mr Olden checked for a pulse and could not feel her breathing, before the pair brought Katrina back inside and laid her on the couch.
Mr Olden told the inquest an ambulance wasn't called because the teen started moving, and because "an ambulance brings police".
But Katrina's father has vehemently denied acting violently towards any of his children and still believes his daughter is alive.
When questioned by Mr Bohnenkamp at the inquest, Mr Olden agreed he had encouraged him to make a statement over the years and to "only speak the truth."
Mr Bohnenkamp also queried why it took Mr Olden more than seven years to reveal what might have been Katrina's fatal blow.
On Monday, Mr Bohnenkamp told deputy state coroner Carmel Forbes the last time he saw his daughter she was calmly sitting on the couch with his partner.
"She turns up on my doorstep, I'm a toxic junkie, I begged for help... and something's gone pear-shaped and you want to blame me," Mr Bohnenkamp told the inquest.
"Yes, I have arguments with my kids. Does it mean I go bury her in a backyard, no."
Mr Olden says he tried to contact Katrina on Facebook following the alleged assault, to find out "who had been injecting her with methamphetamines or speed", but she never responded.
The inquest continues on Wednesday at the Coroner's Court in Lidcombe.
Australian Associated Press
