If I were you the next time he called I would inform him that the conversation was being taped and if he continued to make harassing phone calls you would have no other choice but to seek legal action against him. I would also say if he kept attacking you via internet you could also report him to his ISP for abuse. These simply action should take the wind out of Nepa-Worthless's sails and posssibly send him back to his board. After reading the threats made on the Star BB I would think you would of reported him there beings your a mod here and I know you wouldn't let this abuse go one here.
Sometimes ya just got to kick a guy in the nuts for him to understand how things work.