The sudden death of Johnson & Johnson heiress Casey Johnson has raised several questions and concerns about her life and those she left behind.

After being pronounced dead on Monday, the police conducted an autopsy on Tuesday. Although there was no evidence of any foul play, the county coroner said Johnson’s cause of death remains a mystery. The coroner also ordered to do some toxicology as well as other tests. But the results could take weeks.

Johnson is used to being in the spotlight. She was often called the “Band-Aid Heiress.” She also had a history of arrests.

Johnson grew up with Paris and Nicky Hilton. As teenagers they spent much of their time in nightclubs and swanky parties.

Paris tweeted about Johnson, “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.”

Nicky also tweeted, “Rest in pace Casey Johnson. I love and miss you so much. You are my best friend, my sister…I am broken without you.”

(via CNN)