UPDATE: Gunman wrote disturbing note prior to deadly ambush

WEBSTER, N.Y. -- Chilling new details of that deadly ambush in New York State.

Two fire fighters were shot and killed and two others were shot and critically injured as they rushed to a house fire.

We are learning the suspect's sister is believed to have been found dead in the house.

Also new the 62-year-old shooter left behind a note, here is what part of it said:

"I still have to get ready to see how much of the neighborhood I can burn down and do what I like doing best, killing people."

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