Who pulled the trigger?
Jones' close friend and personal nurse, Annie Moore, was believed to be one of the last people to die in Jonestown. That led to speculation that she could have shot Jones, and then shot herself. But that didn't happen, insists her brother-in-law, Fielding McGehee, co-director of the Jonestown Institute.
Annie Moore died from a gunshot wound from a different gun, in a different location and left a suicide note praising Jones, McGehee says.
McGehee and his wife, Rebecca Moore, Annie's sister (Rebecca lost a total of three family members in Jonestown), are now co-directors of The Jonestown Institute. Their website, supported by San Diego State University, contains extensive research on the massacre.
Another person dismissing the idea of Annie Moore as a killer is author Julia Scheeres. In her book on Jonestown, A Thousand Lives, Scheeres heavily researched Moore's role and concludes she didn't kill Jones.
"There was no hero in this story," Scheeres says. "There's this longing to have someone stop him, but it didn't happen."
Was Jim Jones dying?
Another theory about Jones' death is that he was already dying. Believing his members couldn't survive without him, this was his opportunity to die on his own terms.
Jones may have had an undiagnosed medical condition in the final months of his life. He'd been running a temperature of roughly 100 degrees for six straight weeks and had a deep cough. His friend and physician Dr. Carlton Goodlett examined him three months before the massacre, and, fearing some type of dangerous lung infection, urged him to seek medical treatment immediately. Goodlett was later quoted in news reports saying he believed Jones wouldn't have lived longer than a few weeks more without medical attention. On top of that, Jones had been abusing prescription drugs and amphetamines. On several tapes in the fall of 1978, he speaks slowly and incoherently as if heavily medicated.
"He was increasingly incapacitated," McGehee says. "He may have been dying."
His mental health was teetering, too. In the final months, Jones exhibited paranoia and ordered mass suicide drills, but he also showed humanity. The Jonestown Institute found a recording from two weeks before the massacre where Jones reprimanded two children for pulling the wings off of a fly, tearfully telling them how precious life is, McGehee says.
Yet, hours before the massacre, he arranged for the murders of U.S. Congressman Leo Ryan and three journalists. They had just visited Jonestown to investigate claims of abuse, and Jones knew they would return home and report his criminal activity: He would be headed to jail and his temple would be leaderless.
If he was going to die, he wasn't going to give up control of his followers and the temple he built, Ross says: "This would demonstrate to the world his total power and control over them."
More answers could come from the 250 to 300 tapes from the People's Temple that The Jonestown Institute has yet to comb through.
"Every single time I drop a tape into the tape player, I have no idea what I'm going to hear," McGehee says. "A lot of times you listen to one and think, 'This makes it more confusing than ever.'"
Meanwhile, at Evergreen Cemetery in Oakland, California, 200 people will gather November 18, 2018 to mark the massacre's 40th anniversary. It'll be held in front of the mass grave where 409 of the people who died in Jonestown were laid to rest, and it's likely to be the last big gathering, as survivors and family members age and dwindle in number.
The memorial's four white granite slabs contain the names of all 918 people who died in Jonestown, including Jones. The decision to include his name was controversial, since survivors' family members view him as a mass murderer.
"People still get emotional when they're here," cemetery owner Buck Kamphausen says. "It brings back memories from all those years ago."
The intent of the service is to humanize the People's Temple members and their families.
"These aren't just crazy people," McGehee says. "These were people looking to make a better life."