"Did I question his medication use? Yes. Did I try to get him not to take packets of medication? Yes. Was I in the position to do an intervention? No. We were not married yet and it was not possible. Although I asked him to try not to use the medication that I thought he did not need and there were times that he didn't, I truly believed that in time I would be able to convince him," she wrote.
In a recent interview with "Good Morning America" Jackson's former business manager, Deiter Wiesner, said those who tried to discuss the singer's addiction risked being pushed out or fired.
The Los Angeles coroner's report, indicating exactly what drugs where in Jackson's body when he died on June 25, 2009, has yet to be made public.
ABC News, however, has learned Jackson was given the hospital-grade anesthetic Propofol before his death and was addicted to several powerful painkillers, including OxyContin and Demerol.
Elvis, similarly took a dangerous combination of drugs he called "packets."
Following Elvis' death, coroners found in his body traces of the painkillers morphine and Demerol; the tranquilizers Placidyl and valium; quaaludes; codeine and an unknown barbiturate.
"Both men lived in a world of 'Yes' people who were afraid to intervene and risked being fired if they did," said Stuart Fischoff, a psychologist and editor of the Journal of Media Psychology. "They were surrounded by 'Dr. Feelgoods' who were seduced by having these patients and would give them whatever they asked for."
Dozens of celebrities between Elvis and Jackson have died of similar drug overdoses, a result of the stress in their work and a culture of excess, said Fischoff.
"There is a culture of drug use in the celebrity world. It is essentially a permissive and validating culture," Fischoff said.
Many celebrities turn to drugs to energize themselves to perform and then to relax afterwards, he said.
"You've got to adrenalize yourself -- get into the zone of being a celebrity. It is tremendously draining and fatiguing, which is why many celebs use other drugs to relax and come down. It is a 24-hour cycle of drug use."
Both Elvis and Jackson, he said, were abusing drugs late in their careers when they were past their physical primes.
The strain of constantly having to perform, even when not on stage, and the stress of watching their physical powers deteriorate likely contributed to their addictions.
"Jackson's face had deteriorated and Elvis had gained a tremendous amount of weight. It all showed on their faces and their bodies. They had deal with aging, loss of beauty and waning talent. They found solace in drugs, but they could not live that way," he said.
The two men, of course, shared something else in common. Elvis' daughter, Lisa Marie Presley, was married to Michael Jackson from 1994 to 1996.