LISA MARIE KEPT DEAD SON ON ICE

Grieving mom couldn't let go after Ben's gory shotgun suicide

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EVASTATED Lisa Marie Presley just couldn't let go of her dead 27-year-old son, Benjamin Keough, so the heartbroken mom kept his body on ice at home for two months following his suicide.

That's the heartbreaking revelation from her just-out memoir, From Here to the Great Unknown, which was finished by her daughter and Ben's older sister, Riley Keough, after Lisa Marie's death at 54 from complications of weight loss surgery on Jan. 12 last year.