Jordan Linn Graham allegedly pushed her husband of eight days off a cliff in July at Glacier National Park in Montana.
Johnson died and now Graham is facing a charge of second-degree murder.
According to a criminal complaint, Graham had "second thoughts" about marrying Johnson.
Read: Happily never after: Marriage, then mayhem
In this clip, HLN’s Dr. Drew and his Behavior Bureau watch newly-released video of the couple taken just days before the husband's tragic death.