Click here for a holiday treat, every day from PIX11

Inside the mind of a killer–how can we detect potential dangers

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

(PIX11)-- Brooklyn gunman Ismaaiyl Brinsley was a drifter, who was unsuccessful in mostly everything he tried.

He came to NYC to as he says “to put wings on pigs”, but not before shooting his ex-girlfriend in the stomach.

What pushed Brinsley to kill the officers before turning the gun on himself? Were there any signs of his mental instability beforehand?