Elena Vacek was Michael's 'blood cover' wife with whom he has a child, Adam Samuelle, with.
Unbeknownst to Elena, Michael had actually only married Elena under a deep cover mission to get to her father, Salla Vacek, a terrorist. When their plans to fix the relationship between the two fail, they fake Elena's death to lure Salla out and manage to kill him and fake Michael's death as well.
Section One continues to provide for her and Adam, relocating them unexpectedly when Michael interferes with a mission against her uncle. Some months later, a drunk driver kills Elena, and her son is sent to a foster home.