Those close to Casey Johnson are in mourning over the heiress' unexpected death.
As you might expect, in this technological age, they're turning to Twitter to express sympathy and heartache over the passing of their friend. To wit:
Paris Hilton: "In bed crying, looking at baby pictures of Casey, Nicky and I. I feel so upset. I feel like I've lost a sister. My heart is broken. Miss her."
Lindsay Lohan: "R.I.P. To a friend to and of many—Casey Johnson—my regards to her family, friends and her beautiful daughter Ava* you are in our hearts CJ."
Samantha Ronson: "R.I.P. Casey Johnson. Am so sick of those 3 letters."
And, of course, fiancee Tila Tequila has the most to say:
"I'm still in shock! Once again thank U for the outpour of love and support. I just wish to have some privacy at this heartbreaking time... I can't stop these haunting visions of her and I. We made such a lovely couple, only beginning to spend the rest of our lives together..."
Sources confirm that Johnson twice fell into a diabetic coma over the years; and insulin syringes were found in her home after she died. No cause of death has been determined at this time.