Joanna Yeates's killer tearfully apologised yesterday for putting her family through hell.
Vincent Tabak said his actions were "horrendous" as he showed jurors with his own hand how he strangled his next-door neighbour.
Tabak (33) said he had been attracted to the 25-year-old and "made a pass at her" when she invited him in.
But, giving evidence for the first time at Bristol Crown Court, he denied claims he wanted sex with Miss Yeates.
Tabak, who was shown pictures of Miss Yeates's injuries, wept as he said he would be haunted for life.
Miss Yeates's parents, David and Teresa, and boyfriend Greg Reardon looked on as Tabak told Bristol Crown Court: "I had ample opportunity to call the police and I did not do it.
"I can only say that I am really sorry that I am responsible for her death and that I am responsible for putting her parents and Greg through a week of hell ... knowing where she was. I still cannot believe that I was capable (of that).
"It will haunt me for the rest of my life, no matter what sentence I get."
Tabak denies murder but admits manslaughter. The trial continues.