If you don’t follow Canadian news, you might not be familiar with Luka Magnotta, a homosexual who, in 2012, murdered a Chinese computer engineering student, Jun Lin, by stabbing him 37 times in the chest, 18 times in the abdomen, then decapitated him and hacked his body into 10 different parts, some of which he mailed to government offices and to schools. It is this man and his mother whom you will meet in My Son, The Killer, co-authored by Brian Whitney and Magnotta’s mom, Anna Yourkin. In…