She also engaged in extensive humanitarian work through the Elvis Presley Charitable Foundation.

A few of the early reactions:

ANOTHER PERSON I SHARED DEEP EMOTION WITH HAS PASSED AWAY!

THIS IS SO SAD & SHOCKING!

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Lisa Marie PresleyGetty Images

So beautiful and only 54 years old; I cant actually comprehend it.

Its hard to take when someone so young and full of life passes on.

I feel so bad about Lisa Marie and I wish the best for her children and her family.

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I have the image of little Lisa Marie growing up.

i hope she is at peace in her dads arms.

my heart goes out to her family.

too much grief in just a couple of years.#riplisamarie#LisaMariePresley

Heartbreaking.

Oddly I was just at Graceland yesterday and took this picture.