The adopted daughter of Paul Holmes was left distraught after her patched Headhunter boyfriend suffered a fatal head injury during a confrontation outside a party in the West Auckland suburb of Massey on August 3.
Through tears, the 26-year-old spoke about the night to TVNZ's Sunday program.
"It went really long. I put my hands behind his head and there was just blood coming out ... He didn't move.
"I feel lost and lonely at the moment. I feel like I feel him around me ... I really miss him."
Before Mr Morris' death, Miss Elder-Holmes had been studying to become a nurse, but the incident had forced her to cancel her studies, she said.
"I still have really bad flashbacks. I have really bad nightmares. It just wasn't something that I was prepared to carry on with. The sight of blood is unbearable for me at the moment."
Michael Murray, 33, has pleaded not guilty to murdering Mr Morris.
"I have no words for that person," Miss Elder-Holmes said.
"I wish all the pain and suffering in the world for that person."
She is training twice a day for her Fight for Life bout against Shortland Street actress Frankie Adams this Saturday.
"It would have been extremely counterproductive for me to just sit at home and do nothing for the next year so training has been good to keep me motivated and keep me going," she said.
"Everything I do is for [Connor] now.
"I don't want to lose, that would just be embarrassing. I'm not looking too far ahead. I'm just training baby steps."
She also spoke about her Clean Eatz Facebook page, on which she promotes healthy eating.
"I do have control over my health, my wellness. I think that's one think that's making me feel in control and in charge at the moment."
Miss Elder-Holmes also spoke about her battle with methamphetamine over the years.
"I don't know that person anymore," she said.
"She was really sad and lost."
Miss Elder-Holmes and Mr Morris had lived a hermit-like life in their west Auckland home while getting clean. She told how she cut several people out of her life.
"We just stayed at home, just us two. I've never spoken to anyone again that I used to speak to.
"I would say Connor saved me. Connor would say we saved each other."
