Criminal Minds2005

Penelope Garcia:
His name is Tanner Johnson, and life has not been kind.

Jennifer Jareau:
He lost a child, didn't he?

Penelope Garcia:
Yeah, last year. Ten year old son Jeremy. According to reports, Jeremy was playing with a friend, they were, like, fake 'wrestling', when Tanner, a freelance photographer/night time doorman, got a call, left the room to take it; when he returned, his son was unconscious, the friend was trying to revive him from a chokehold gone horribly wrong.

Aaron Hotchner:
The son was strangled; that's why he uses a garrote.

Penelope Garcia:
Jeremy was on life support for a few days, but he died.

Alex Blake:
And Tanner blames himself. He stopped watching for a minute and he lost his son.

David Rossi:
He hasn't stopped watching since. The grief must have consumed him.

Jennifer Jareau:
That's a hell of a stressor, but what triggered the murders?

Aaron Hotchner:
Garcia, what happened to Tanner's wife? Did the marriage survive?

Penelope Garcia:
Uh... nope. She kicked him out two months ago. Right before the killings started.

Jennifer Jareau:
So he loses his child, then his wife and home. It's enough to make anyone unstable.

Alex Blake:
Add guilt to that, and it's all too much. He dissociated.

David Rossi:
Paternal transference. Claimed the residents of the apartment building as his family.