From A Visual Timeline. I also read about it in a newspaper following his execution.
“While the guards were cleaning Ted’s cell after his execution, an old photo fell out of one of Ted’s Law books.
The photo had been carefully folded and discreetly
tucked between the bindings of the book. The photo was
of a rather plain looking woman. She had cherry blossoms intertwined in her long, long, light brown hair and
wore a Mexican Blouse. Her childlike smile had lit up
her large brown eyes as she held up a baby rabbit for the
camera. The photo was dated 1969. On the back, in Ted’s
handwriting it was written “You will always be the love
of my life. I thank God for your love …” The ink was still
fresh, indicating Ted had written this a few hours before
his execution. The guard asked the Superintendent if he
recognized the woman in the photo. “Oh yeah, simple,”
replied the Superintendent. “That’s Bundy’s old lover
… Elizabeth Kloepfer … I think was her full name.” He
shrugged “He always just called her Liz”