Notorious leader of one of the deadliest cults in the history of the United States has reportedly been rushed to a local hospital, and his condition is very severe.

Manson has been in prison since 1971 after he was charged with seven counts of first-degree murder, and one count of conspiracy to murder after he and the members of the "Manson Family" went on a gruesome killing spree in Los Angeles in the 1960s. They were trying to incite a race war he called "Helter Skelter."

While he was only charged for the deaths of Aibgail Ann Folger, Wojciech Frykowski, Steven Earl Parent, Sharon Tate Polanski, Jay Sebring, and Leno and Rosemary La Bianca, his cult was also responsible for a number of other crimes, including theft, assaults, and the attempted assassination of President Gerald Ford.

Mason later received additional convictions for the murder of musician Gary Hinman and Donald Jerome "Shorty" Shea. He was sentenced to death, but when the death penalty was ruled unconstitutional in 1972, he was re-sentenced to life with the possibility of parole.

He filed for parole multiple times, but was denied every time. In 2012, he was turned down for the 12th time, after the panel noted that Manson had 108 violations, didn't understand the magnitude of his crimes, and showed no remorse. He wouldn't be eligible for another hearing until 2027.

Due to his dangerous nature and failure to be a model prisoner, Manson has been living in a separate cell in the Protective Housing Unit at California State Prison. According to reports, he has been cited for "assault, repeated possession of a weapon, threatening staff and possessing a cellphone."

However, it seems like staff at the correctional facility may not have to deal with Manson's shenanigans much longer because he has become too weak. Manson was hospitalized back in January for severe gastrointestinal bleeding, and was scheduled to undergo surgery, but he was deemed too fragile for the procedure and sent back to prison.

Ten months later, the convicted criminal is back in the hospital, but this time his condition is said to be worsening.

A spokeswoman for the California Department of Corrections and Rehabilitation declined to comment on the 83-year-old killer's hospitalization, citing privacy laws which bar the facility "from commenting on protected health information for any inmate in our custody."

However, a source familiar with Manson's situation has told TMZ that "it's not going to get better for him."

Manson was transported from the prison to a Bakersfield hospital three days ago, and has reportedly been receiving various treatments. The source informed the celebrity news site that Manson has been laying still under a layer of blankets, and "looks ashen."

The source also revealed that "it's just a matter of time" as Manson's health has been steadily deteriorating.

Manson's ailment is indeed very serious because the state prison he lives in has medical facilities that are equipped to treat a plethora of issues, however prisoners are sent to outside hospitals if they require "surgical services, emergency care, or diagnostic services of an acute nature," according to another spokeswoman.

Stay tuned for more updates on this developing story.