Callum Wheeler, 22, used a railway jack - a tool used to lift train tracks - to beat mother-of-two Mrs James to death as she walked in fields and woodland near the back of her home in Snowdown.
Julia James told her husband Paul that she had noticed weird dude later identified as Callum Wheeler in the months before he murdered her in woods near her home in Kent last year.
Porn-obsessed Callum Wheeler, 22, from Kent who has been convicted of murder today, was also so isolated he spent most of his time in his bedroom, and barely knew his brother.