Casey Johnson, the young heir to the Johnson & Johnson forutune and notorious party girl, died in Los Angeles, Tuesday, according to a spokesman for the family.

Johnson, 30, was found in her bed, and had been dead for several days, the New York Daily News reports. The police believe her death was due to natural causes, as in she wasn’t murdered, although an official cause of death is pending. She had juvenile diabetes, and police are considering that as a potential factor in her death.

The cause of death is still unknown.

Reality TV star Tila Tequila, who was enganged to Johnson, has been posting on twitter since the death.

“I miss her so much. Can’t stop crying,” Tequila tweeted Tuesday night about Johnson. “Haven’t slept for days. … My entire house is filled with her stuff. I’m in bed without her here.

“You are my Angel now … I know u are watching from above,” Tequila wrote. “I promise u that I will continue our dreams we planned 2gether.”

Casey’s celebrity friends shared their concern online as well. Paris Hilton, a childhood friend of Casey’s, wrote, “I feel like I’ve lost a sister.” DJ Samantha Ronson responded more angrily. “Am so sick of those 3 letters, so tired of losing friends to something as senseless as a drug overdose. WAKE UP people.” Lindsay Lohan retweeted the message, even though Lindsay is probably the one most in need of heeding Sam’s warning.

Celebs Tweet condolences Following Casey Johnson's Death