updated 01/05/2010 AT 2:45 PM ET
•originally published 01/06/2010 AT 3:15 PM ET
Casey Johnson’s death at age 30 didn’t entirely surprise those in her inner circle.
Friends tell PEOPLE the troubled Johnson & Johnson heiress led an increasingly erratic existence in the months before she was found dead in her Los Angeles home Tuesday. “She had so many ups and downs, but lately, it wasn’t very good,” a pal tells PEOPLE. “She tried rehab, wanted things to change but it didn’t stick.”
The source says Johnson had recently been acting more and more bizarre. “Just a few months ago, she was living like a crazy person,” the pal says. “Super erratic behavior. People could barely be around her.”
Johnson, an openly gay socialite engaged to Tila Tequila, had a history of diabetes. Her cause of death appears to be natural, according to officials, but toxicology reports are still pending.
“Casey thought being with a woman would make her edgy,” another friend tells PEOPLE. “She never had luck with men because she was so weird and awkward.”
Strained too were relationships with other friends and family. The friend says she spent a lot of time with Johnson until a year ago – when she stopped talking to her. “She was very troubled. Several of her family members didn’t speak to her. The other Johnson kids felt she damaged their name.”
Johnson was estranged from her family because of her crazy antics and mishandling of her fortune, friends say. “Her family couldn’t handle her behavior and lack of respect, so they cut her off,” the pal says. “They thought it would teach her to turn things around.”