Americans were stunned over the weekend to find out that Ted Kaczynski, notoriously known as the "Unabomber," died while in custody, as first revealed by a Federal Bureau of Prisons (BOP) spokesperson. 

According to the New York Post, the 81-year-old convicted killer who made 16 homemade bombs that killed three people, was found dead inside his North Carolina-based prison cell on Saturday morning.

The Post noted:

Kaczynski, who gave up a promising career to live as a hermit in a Montana cabin, went almost 20 years before finally being captured in April 1996 and is considered the most prolific bomber in American history.

A late-breaking Fox News report revealed that Kaczynski's cause of death had been ruled as a suicide.

The BO did not issue the report, but Fox News cited three sources close to the investigation and familiar with the situation. The prison bureau released a statement in the wake of the suicide reports.

"For safety, security, and privacy reasons, this office does not share specifics regarding the cause of death for any inmate. The official cause of death is determined by the medical examiner and not the Bureau of Prisons (BOP)," the agency said.

The BOP added: "We have no additional information to provide beyond this and the attached press release."

The ‘Unabomber’, Ted Kaczynski, has died in an apparent suicide https://t.co/FAa2y4hsud

— Daily Caller (@DailyCaller) June 12, 2023

Fox News noted:

At approximately 12:25 a.m. Saturday, inmate Kaczynski, a Harvard-educated mathematician convicted of running a 17-year bombing campaign that killed three people and injured 23 others, was found unresponsive at the Federal Medical Center (FMC) Butner in Butner, N.C., the Federal Bureau of Prisons said in a press release obtained by Fox News Digital.

The BOP's press release added: "Mr. Kaczynski was an 81-year-old male sentenced in the Eastern District of California to a Life sentence for Transportation of an Explosive with Intent to Kill or Injure, Mailing an Explosive Device with Intent to Kill or Injure, and Use of a Destructive Device in Relation to a Crime of Violence,"

"He had been in custody at FMC Butner since December 14, 2021. FMC Butner is an administrative security facility and currently houses 833 male offenders," it continued.

Kaczynski was originally being held in a maximum security prison in Colorado, but was transferred several years ago to a different facility in North Carolina for his medical needs.

His death has already prompted fresh conspiracy theories, given that his cause of death was by suicide, which seems to happen frequently to people of great controversy.

It's unclear when the BOP will release the official cause of death, but it'll be interesting to watch.