[SPOILER ALERT] This particular video focuses on Teresa Halbach's ex-boyfriend.

An expert explains how to tell when someone is lying about a murder that they committed in certain situations. While it appears that this video may have been edited to add in the Making A Murderer parts, it still seems to make plenty of sense.

The documentary never comes out and says that people should suspect Teresa Halbach's ex-boyfriend, Ryan Hillegas, but he always seemed to be a little too close for comfort to it all. Especially about him just guessing her username and password for her cellphone account.

What do you think?