I doubt this guy killed those people (at least by himself). He's too skinny looking to do it, particularly since the boy friend who was killed was so muscular.
Makes you think it was a conspiracy, doesn't it?
I dunno. All he needed to do was hold one of the kids hostage, say, a knife to the throat, and I suspect the family would let themselves be tied up, or tie each other up on the orders of the guy. Once they were tied up, he could do anything to them.
Never rule out the power and cunning of pure evil.
"I doubt this guy killed those people (at least by himself)."
It is strange. They guy doesn't appear to have a history of violence against adults.
According to his online resume, he's into Karate and the martial arts. Speed trumps muscle.