Mark Dixie admits that while under the influence of drugs and alcohol he had sex with Sally Anne Bowman, a teen model, one night in September 2005, near Croydon, UK.
It was pretty violent sex, by the sounds of it. He reportedly left bite marks on her cheek, neck, and nipples.
What he denies is killing the girl, stabbing her several times so savagely in her neck and abdomen that some of the wounds passed right through her body.
The sex, Dixie insists, happened after he found Bowman already dead, lying in a pool of blood on the street outside her home.