LOS ANGELES, California (CNN) -- Michael Jackson's father suspects his son was murdered and that Dr. Conrad Murray is "just a fall guy" in a conspiracy.

Joe Jackson appeared on CNN's "Larry King Live" on Monday night, just hours after sitting in a court room to hear Murray plead not guilty to a single charge of involuntary manslaughter in connection with his son's death last summer.

A Los Angeles judge set bail at $75,000, despite arguments from the prosecutor that Murray is a flight risk and needs a higher bail. Murray posted the bond and was released several hours later.

Michael Jackson's family -- including his parents, four of his brothers and one sister -- filled the first two rows of the small courtroom.

"I was looking for justice, and justice, to me, would be a murder charge," Joe Jackson told King.

Prosecutors charged Murray, who was Jackson's personal physician, with causing the pop star's death "without malice" by acting "without due caution and circumspection."

Murray was with the pop star when he died on June 25, 2009.

The Los Angeles County coroner ruled Jackson's death a homicide, resulting from a combination of drugs, primarily propofol -- a powerful anesthesia -- and lorazepam.

Joe Jackson suggested it was more than a doctor making a fatal judgment.

"To me, he's just a fall guy" Jackson said. "There's other people, I think, involved with this whole thing. But I think that he's interrogated -- he would come clean and tell everything he knows."

He said Michael Jackson told his mother, as he was preparing for his comeback concerts in London, England last year, that he thought he would be killed.

"He was afraid to even do all of these shows, because he was afraid that he wouldn't get a chance to finish all of the show," Joe Jackson said. "He couldn't do all those shows back to back. Even his kids say that he had told them that he would be murdered."

Jackson's sister La Toya Jackson earlier issued a similar statement through a publicist.

"Michael was murdered and although he died at the hands of Dr. Conrad Murray, I believe Dr. Murray was a part of a much larger plan," her statement said. "There are other individuals involved and I will not rest and I will continue to fight until all of the proper individuals are brought forth and justice is served."

Her statement did not elaborate on what she meant in her reference to "a much larger plan."

Jackson's parents, La Toya Jackson, and brothers Jackie, Jermaine, Randy and Tito Jackson attended Monday's hearing.

"Not enough," Jermaine Jackson said when asked what he thought of the charges.

The involuntary manslaughter charge against Murray came after more than seven months of investigation that included the Los Angeles coroner, police, state and federal drug investigators.

If convicted, Murray would face a maximum four-year prison sentence, according to the prosecutor's office.

Murray -- a native of Trinidad -- was ordered to surrender his passport and remain in the United States through the trial.

The judge refused to suspend Murray's medical license as a term of his bond, but he did order him not to use any anesthesia on patients.

"I don't want you sedating people," the judge told the cardiologist, who resumed practicing medicine at his clinic in Houston, Texas, in November.

"He's going back to his family and back to his patients," defense lawyer Ed Chernoff said after the hearing.

Murray was hired last spring as the singer prepared for comeback concerts.

The doctor told Los Angeles police that he was with Jackson at his $100,000-a-month rented Holmby Hills mansion through the early morning hours of June 25, 2009, in an effort to help the pop star fall asleep, according to a police affidavit.

He administered sleep aids, and after Jackson finally began sleeping in the late morning hours, Murray said, he left the bedroom for "about two minutes maximum," the affidavit says.

"Upon his return, Murray noticed that Jackson was no longer breathing," it says.

The doctor stayed with Jackson as an ambulance rushed him to UCLA Medical Center.

Efforts at CPR proved fruitless, and Jackson was pronounced dead at 2:26 p.m.

The Los Angeles County coroner ruled Jackson's death a homicide, resulting from a combination of drugs, primarily propofol and lorazepam.

The coroner's statement said Jackson died from "acute propofol intoxication," but there were "other conditions contributing to death: benzodiazepine effect." Lorazepam and two other drugs Murray said he used are benzodiazepines.

The doctor told investigators he had given Jackson three anti-anxiety drugs to help him sleep in the hours before he stopped breathing, a police affidavit said.

Murray had been treating Jackson for insomnia for six weeks at the time of the singer's death. The doctor told investigators he gave Jackson 50 milligrams of propofol, the generic name for Diprivan, diluted with the anesthetic lidocaine every night via an intravenous drip.

The doctor told police he was worried that Jackson was becoming addicted to the drug and tried to wean him off it.

During the two nights before Jackson's death, Murray said, he put together combinations of other drugs that succeeded in helping Jackson sleep.

An involuntary manslaughter charge against a physician is a "very unusual thing to see," according to Dr. Bruce Cranner, who also is a New Orleans defense lawyer in medical cases.

He said prosecutors may have a "pretty good case" against Murray if they can show he did not take proper precautions when giving Jackson the anesthetic propofol.

The drug is normally used only in a hospital setting and almost always with an anesthesiologist present to constantly monitor the patient's heart rate and breathing, Cranner said.

"It can cause patients to have a very fast respiratory arrest," he said.

The full autopsy report, which was released Monday afternoon, included an analysis by an anesthesiology consultant of the use of propofol.

The consultant, Dr. Selma Calmes, concluded that the "standard of care for administering propofol was not met."

"There was no evidence of an infusion pump for control of an IV infusion. No monitors were found at the scene; a blood pressure cuff and portable pulse oximeter were recovered from a closet in the next room," Calmes wrote.

An oxygen tank was found near where Jackson slept, but it was empty when the coroner investigator checked it two weeks after Jackson died, Calmes said.

"Multiple opened bottles of propofol were found with small amounts of remaining drug," Calmes said. "A used bottle should be discarded six hours after opening, to avoid possible bacterial growth."

"The level of propofol found on toxicology exam are similar to those found during general anesthesia for major surgery," Calmes said.

During such surgery, any patient would be "intubated and ventilated by an anesthesiologist," she said.

The consultant's report said the level of lorazepam found in Jackson "would have accentuated the respiratory and cardiovascular depression from propofol."

Murray's next court appearance is set for April 5, but at the main courthouse in downtown Los Angeles. Monday's appearance was at the airport branch of the court.

-- CNN's Stan Wilson and Ted Rowlands contributed to this report.