A Queens woman who worked at a domestic violence shelter and “was passionate about helping people” was fatally shot in the head by her ex-con fiancé — and then left to decay “like roadkill,” according to cops and the victim’s sister.

Angelique Apostol, 38, was found lifeless inside the St. Albans home of her partner, Mark Washington, on June 24, cops and kin said.

She was last seen alive exactly two weeks earlier on June 10, the day she and her beau had planned to head to Game 4 of the Knicks’ historic championship run at Madison Square Garden – but never made it, according to her sister, Melanie Apostol, 37.

Instead, Washington allegedly shot…

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