Former cult leader Charles Manson, who was hospitalized earlier this week, might not survive after the hospital canceled his surgery citing his weak health, TMZ reported late Sunday. The 82-year-old, who inspired his followers to kill seven people in 1969, returned to prison after doctors went back and forth over his surgery.

Manson was admitted to a medical center in Bakersfield, California, for gastrointestinal bleeding last Sunday. Doctors wanted to perform the surgery shortly after Manson was admitted but he refused to undergo the procedure, TMZ reported. He later agreed to the surgery, but doctors found he was too weak to survive the procedure.

"He's not good. His health is failing," a source told TMZ, adding that he was taken back to the California State Prison, Corcoran, because of security reasons.

Manson, who has been in jail since 1971, was convicted of first-degree murder and conspiracy, along with three of his followers. The group was convicted of killing actress Sharon Tate, who was pregnant at the time, her hair stylist Jay Sebring, student Steven Parent, coffee heiress Abigail Folger, writer Wojciech Frykowski, supermarket owner Leno LaBianca and wife Rosemary LaBianca over a span of two days.

Manson, who ran a drug- and sex-fueled commune outside of Los Angeles, was denied parole 12 times, and has spent time behind bars at San Quentin, Vacaville and Corcoran.

“I want to get up there in person and see what's going on. This could be it, that's my greatest fear. If he's on his deathbed I would like to tell him I love him, because I do,” his son Matthew Roberts told Radar Online on Wednesday. “Everybody has a unique and special sort of love for their progenitors even if they are different or disturbed or monsters.”