On Monday, the 30-year-old socialite's body was found in her Los Angeles home and there are reports that she may have been dead for several days. Police said Monday that Johnson appeared to have died of natural causes.
"Our officers conducted a preliminary investigation which appears to be an apparent natural death,'' Los Angeles Police Department spokeswoman Officer Sara Faden said." There was no evidence of any foul play and the case is now being handled by the coroners, pending a toxicology report.''
A spokesman for the Los Angeles coroner said Tuesday an autopsy could be performed by today, but final autopsy results are typically not available for several weeks.
Johnson leaves behind a 3-year-old daughter, Ava Monroe, whom she adopted in 2007 from Kazakhstan, who was reportedly not living with Johnson at the time of her death. She also leaves behind numerous questions about what went wrong for the woman who seemingly had it all.
"I don't know what happened," Lizzie Grubman, a New York publicist and friend of Johnson's since she was a teenager, told ABCNews.com. "She was an amazing girl with a huge heart, very funny and will be missed by me dearly. I was blessed to know her."
Grubman, who had spoken to Johnson about a month ago, said she saw no reason why Johnson would try to intentionally harm herself. "She was in great spirits. She had her daughter she loved dearly. She had great friends," she said.
Johnson had juvenile diabetes since childhood. "It was very serious," Grubman said. "She treated it with insulin. When she worked as an intern, she was embarrassed by it. She didn't want people to know. As she got older, she learned to deal with it."
In a recent red carpet appearance with Tequila, Johnson held up a syringe in front of the paparazzi and declared, "I'm diabetic."
Ken Baker, executive news editor for E! News, told ABCNews.com that Johnson's life was not what it appeared. In August, Johnson and then girlfriend Semel approached Baker about doing a reality show on their lives as a Hollywood lesbian couple.
"How strange, I thought, she was this heiress from one of the wealthiest families and wanted to be a reality star," Baker said. "There was something incongruous about that. What she made clear to me was that she was basically on her own.
"She was ready to put her daughter and her life on TV," Baker said. "She wanted to make her own family and her own life. She just really wanted to create a family. She felt she didn't have that for whatever reason."