The Sum 41 frontman was married to the Canadian pop rocker for three years until their split in 2009. During that time her alleged stalkers turned their attention to Deryck as well, particularly one British man who sent him death threats at such an expert level he eventually became the subject of a Federal Bureau of Investigation (FBI) investigation.

"My ex-wife had a lot of stalkers. And being married to her, they sort of wanted to come after me," he told "There was this one guy from the U.K. who started sending death threats. He was really weird because the stuff he sent had no fingerprints on it and it was at a level that was a little bit more sophisticated. It turned out to be way more serious and he wanted to kill me for some reason. Thankfully the FBI found him over here (the U.K.)."

Avril has had a number of stalkers, such as James Speedy from Seattle, Washington who was charged with felony stalking in 2004 for bombarding the Sk8er Boi star with letters and emails. However, it isn't known which stalker Deryck is referring to.

The former couple has remained friends since the split and Avril lent her support to Deryck when he almost died after his liver and kidneys collapsed due to alcohol abuse in 2014.

They have both remarried with Deryck tying the knot with model Ariana Cooper last year (15) and Avril marrying Nickelback frontman Chad Kroeger in 2013. They separated last year (15) but have since sparked rumours they are back together by attending an awards show together.