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He read several emails from between 2014 and 2016, saying some of them were copied to the couple’s son.

In one email to Capuano, Fox said he told their son during a summer visit about his plans for his mother.

“He is fully aware of my plan to use him as a pawn to ruin your life and he seems to be OK with it,” Fox said.

In a January 2015 email to Capuano, Fox wrote: “The singular goal of my life is to destroy your life. I don’t care if I die penniless.”

Jurors heard the pair was embroiled in a custody battle and that the boy’s demeanour changed after returning to Arizona from a visit with his father. The court heard the boy spent much of his time in his bedroom and disengaged from his family.

In December 2015, Fox was ordered by an Arizona judge to stop emailing Capuano, but a website the man created that taunted her, her family and friends was not ordered shut down.

Myhre said Fox was pleased with the publicity that drew more people to the site, all the while maintaining that he would do whatever he could to legally pursue his goal of humiliating Capuano.

The seven men and five women on the jury have heard four handguns were found inside a computer in a box that Fox shipped to a California address from Burnaby, B.C.

Fox has represented himself at the trial, but court-appointed defence lawyer Tony Lagemaat cross-examined Capuano.

Lagemaat told jurors Monday that both Capuano and Fox were engaged in a nasty game in which they taunted each other by email and that Capuano provoked the man by calling him names and saying he had a “sick fixation” on her.