Conner, 32, a convicted rapist who murdered a chambermaid, Sandra Parkinson, in Devon last month and who is suspected of six other killings, wrote: 'I can't do anything to help you through your grief. I really wish I could. All I can do is kill myself. I hope it helps, even if it's just a bit.'
Conner's body was found hanging from a tree in Huntingdon, Cambridgeshire, on 7 August, the inquest at Huntingdon was told. Underneath the body were three notes.
Ms Parkinson, 22, was gagged, raped and strangled last month as she went for a clifftop walk at Sharpitor, near the holiday resort of Salcombe where she worked.
Forensic scientists used DNA tests to establish that her killer had also raped a 67- year-old former magistrate, Muriel Harvey, in Ludlow, Shropshire, in 1992.
Conner was also convicted in 1986 of raping a 16-year-old near his home village of Thurnscoe. He served four years of a six-year sentence.
In the longest suicide note, Conner wrote: 'This letter is to the mother and brothers of Sandra Parkinson. Please, I am sorry for what I did to her. Please believe me, it wasn't me, it was the other bastard I can't live with. I beg that you can forgive me for what I did.'
The coroner, David Morris, recorded a verdict of suicide.
Conner's notes exposed a character tormented by remorse who wanted to be punished, according to former chief psychologist at Broadmoor Tony Black.
He said: 'Many people who commit violent crimes blame all sorts of other factors, but there is a group who are well aware that they can't control themselves.'Reuse content