Tragic baby-shampoo heiress Casey Johnson spent the last months of her life in a suicidal drug haze, living in squalor, surrounded by hangers-on and cut off from her family fortune, those close to her said yesterday. 
 
 The 30-year-old Johnson & Johnson scion, who was found dead in LA on Monday, had gone from being in line to a multibillion-dollar fortune to living in a garbage-filled, rented house with no electricity, water or gas — but with rats in the pool — as she battled illness and emotional demons. 
 
 “She was very sick with diabetes and would often fail to take her insulin correctly, and was rushed to the hospital three or four times in the last six months,” a source close to Johnson told The Post. 
 
 Still, while a family source acknowledged that Johnson “had two specific incidents in the last year where she was taken to intensive care with diabetic comas . . . it was nothing to do with not taking her insulin.” 
 
 FROM A ‘SWEET’ BILLIONAIRE CHILD TO LONELY ADDICT 
 
 CINDY ADAMS: CASEY’S TRAGIC FALL 
 
 READ: ALL THAT TWITTERS NOT GOLD IN THE CASE OF TILA TEQUILA 
 
 FLASHBACK: TILA, CASEY ENGAGED 
 
 PHOTOS: LIFE OF CASEY JOHNSON 
 
 “She had an insulin pump that delivered her medicine automatically,” the source insisted. 
 
 “Recently, her diabetes became brittle, or labile, which meant that the insulin was becoming less effective, and her body was developing a tolerance to it. She was always at risk for going into a diabetic coma,” the source said. 
 
 Johnson’s downward spiral began gaining speed late last year. There was an episode in which her former girlfriend Courtenay Semel allegedly set her hair on fire. Johnson was also busted for grand theft for breaking into and swiping items from a friend’s home, and her adopted daughter was wrested away from her by her concerned mother. 
 
 Friends said Johnson coped by self-medicating — popping copious amounts of OxyContin, Klonopin and Adderall, as well as drugs, such as marijuana, ecstasy and cocaine. 
 
 Her family persuaded her to go into rehab a few months ago, but she checked out early and refused to go back. 
 
 Things got so bad that in November, Johnson tried to commit suicide, sending a text message to her Semel, saying, “I’ve taken a lot of pills, and I’m going to sleep forever,” friends told The Post. 
 
 Semel — whose father is former Yahoo! CEO Terry Semel — called an ambulance, and Johnson was in the intensive-care unit for three days. 
 
 Her desperate cry for help came not long after close pal Jasmine Lennard accused the hopped-up heiress of breaking into her Los Angeles home and stealing thousands of dollars worth of clothes and jewelry and leaving a vibrator in her bed. 
 
 When Johnson — daughter of New York Jet owner Woody Johnson — was arrested, her anxious mother, Sale Johnson, hoped the incident would drive her to get help, her friends said, but it was in vain. 
 
 “When Casey was arrested for grand theft, her family and her friends thought this would be the catalyst for her to finally get the help she really needed,” one pal said. “They wanted to get her into a psychiatric hospital. But she was bailed out by a friend and went back to her old ways.” 
 
 A friend added, “Her family were giving her tough love and said she was cut off unless she went into [rehab]. They did everything they could to help her, but she wouldn’t help herself.” 
 
 The notorious shopaholic returned to her rented LA home — where she lived without utilities because she was unable to pay her bills — and kept her Porsche hidden in the garage so it couldn’t be repossessed. All the while, the grounds were overrun by vermin. 
 
 “It was like ‘Grey Gardens,’ ” a source told Page Six last month. “There are dirty dishes everywhere and rotting food. There is graffiti on the walls. The pool looks like a swamp.” 
 
 As Johnson sank into a sickening world of drugs, she surrounded herself with an ominous group of lowlifes. 
 
 Neighbors said there was a revolving door of shady-looking characters at Johnson’s house — whose gate was inscribed with the name “Grumblenot.” 
 
 “I saw very trendy, rock-and-roll, seedy types coming in there at all hours of the night,” said a neighbor. 
 
 In her dark pit of drugs and despair, Johnson claimed she had found love — running into the arms of D-lister Tila Tequila. 
 
 The two announced last month that they were engaged to be married in a disturbing online video in which both lay in their underwear — Johnson in a noticeable state of stupefaction. 
 
 “[Tequila] was taking advantage of a sick girl. Casey would never have done that had she been in her right mind,” one friend said. “She looked totally out of it in the video.” 
 
 The last anyone heard from Johnson was in the early morning of Dec. 29, when she posted a tweet on Twitter: “Sweet dreams everyone.” 
 
 Her body was found six days later. 
 
 The Los Angeles Coroner’s Office said an initial autopsy was inconclusive, although there appeared to be no evidence of suicide or trauma to her body. 
 
 As for drugs in the home, there was “an insignificant” amount of prescription pills, law-enforcement sources told TMZ. 
 
 Toxicology tests could take up to six weeks. 
 
 Johnson’s New Jersey-based family yesterday said in a statement that it had arranged for “Casey to be flown back east to her final resting place.” There will be a private funeral service this week. 
 
 They have already set up a memorial fund in her honor with the Juvenile Diabetes Foundation, and urged people to donate. 
 
 “Casey struggled throughout her life fighting this disease, and she would want to see all of us continue that fight on her behalf,” the statement said. 
 
 Additional reporting by Tori Richards in Los Angeles 
 
 lukas.alpert@nypost.com 
 
 ||||| **Scroll down for photos** 
 
 British reality show model Jasmine Ferrard had no love lost for her former friend Casey Johnson when Johnson allegedly stole from her and used her vibrator in her bed a few weeks ago, but now that the heiress is dead Jasmine has only kind things to say--to an outlet that routinely pays its sources for stories. 
 
 "Casey was a fragile, beautiful, witty, wonderful girl who was desperately looking for love," Jasmine, 24, told RadarOnline.com. "Did I love her? Yes. I tried so hard to save her but I couldn't." 
 
 The same day she gave Radar an 'exclusive' interview Jasmine spoke to Life & Style about her devastation. Then she threw in a custody offer. 
 
 "Casey always made me promise if anything happened to her I would watch over her baby Ava, and with her family's blessing I will honor that promise," she told the magazine. Casey leaves behind a 3-year-old daughter whom she adopted from Kazakhstan in 2007. 
 
 Jasmine blames Casey's histrionic fiance Tila Tequila for thwarting the Johnson family's attempts to put Casey in rehab. "Tila is a sick, sick girl," she told Radar. Here is Jasmine's Twitter hate screed to Tila: 
 
 
 
 In 2005 Jasmine was a contestant on UK's 'Make Me a Supermodel,' where she called judge Rachel Hunter "spotty, finished and fat." She reportedly had an affair with Simon Cowell while he was dating Terri Seymour in 2006. Both Jasmine and Casey have been romantically linked to socialite and Yahoo! heiress Courtenay Semel. 
 
 Here's Jasmine at a party in 2007: 
 
 
 
 Here she is with her sister Jessica in 2005: 
 
 ||||| Casey Johnson' Big Money Problems 
 
 Casey Johnson' Big Money Problems 
 
 had some pretty severe financial problems in the months before she died. Johnson was sued for not making lease payments on a Porsche and lost a five-figure lawsuit to a nanny service ... both in the last few months.According to documents obtained by TMZ, Johnson was sued by Porsche in September 2009 for failing to make the $2,300.47/month lease payments on her 2009 Porsche Cayenne Turbo S during the months of June, July and August 2009.She eventually lost the car to Porsche in December.As for the nanny service, the Elizabeth Rose Agency filed a lawsuit in August 2009 claiming Johnson owed them money. The agency won a judgment in December for $20,189.35. ||||| Please confirm your birth date: Please confirm your birth date: 
 
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 In the last month of her life, Casey Johnson grabbed headlines with a messy engagement to reality star Tila Tequila. How a billionaire socialite wound up in bed with a hardknock stripper, filming soft-core porn on a webcam. 
 
 Before their engagement, both women were minor tabloid figures who sailed into the limelight with sordid, humiliating tales of crime: Tila as the victim of a confusing domestic violence case, and Casey as the accused perpetrator of a scandalous psychosexual theft. When the chips were down, the women found each other—then lost each other, in mysterious circumstances amid a torrent of contradictions. 
 
 Tomorrow I'll sort out the myriad Rashomon-like narratives, villains, heroes, and victims. For now, though, just the facts over the course of the two emotionally-packed months in the lives of four Hollywood sapphists, one football player, and a family billionaires. (Which seems short, but remember: Romeo and Juliet did it in four days.)
– As the initial autopsy results for Casey Johnson came back inconclusive but with no evidence of suicide, a slew of news—and opinions—about the heiress’s tragic final days also emerges. The latest: Johnson was living in a house filled with garbage and rats in the pool, but with no electricity, water, or gas, friends tell the New York Post. “There are dirty dishes everywhere and rotting food,” one source says. “There is graffiti on the walls. The pool looks like a swamp.” TMZ details the financial problems Johnson was having, including losing her Porsche in December for failing to make the lease payments, and owing a nanny service $20,189.35. Her diabetes was getting worse—a family source says insulin was becoming less effective—and another source says she had been “rushed to the hospital three or four times in the last six months.” One friend says Casey would never have gotten involved with Tila Tequila “had she been in her right mind,” and that the reality star “was taking advantage of a sick girl.” The Huffington Post has an extensive look at model Jasmine Lennard, with whom Johnson was famously feuding before her death—Lennard has now, of course, done a 180 and is offering to take care of the daughter Johnson left behind. Gawker, meanwhile, offers a detailed timeline of Johnson’s quickie romance with Tequila, as well as the various troubles both women were going through as their relationship ran its course.