User:UnSub-Zero/sandbox 4

"I hope this doesn't ruining your trading day."

Mark Orrin Barton was a spree killer who murdered his family before going on a shooting spree that ended with his suicide.

Modus Operandi
When he killed his family, Barton bludgeoned them with a hammer. During his shooting spree, he shot his victims with four pistols, a Colt 1911A1, a Glock 17, an H&R revolver, and a Raven MP-25.

On Criminal Minds
Barton was mentioned in Children of the Dark.