Dive into the dark world of prison violence as we explore chilling cases of murderers who committed additional killings while behind bars. These shocking stories reveal the ongoing danger and brutality that can exist within prison walls, where some criminals continue their violent paths even after being sentenced.
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00:00Do you remember when you learned that your father murdered Jeffrey Dahmer?
00:04Yes. It was about 10, I saw it on TV.
00:10Welcome to WatchMojo, and today we're looking at the most chilling instances
00:14of convicted murderers who reverted to their old ways while locked up behind bars.
00:19Schaefer carries to the grave confessions, maybe where the bodies were.
00:26Robert O'Neill
00:28In February 1980, Robert O'Neill was sentenced to life in prison for murdering 78-year-old
00:33Ralph Roscoe Sherrick. The previous year, O'Neill had broken into the home of Sherrick's son-in-law,
00:39where he encountered and fatally shot him after robbing the house.
00:42While serving his sentence at the Missouri State Penitentiary,
00:45O'Neill joined the white supremacist group the Aryan Brotherhood.
00:48His disruptive behavior in prison led to him being locked up in a special unit
00:52reserved for the most dangerous inmates. On February 3, 1984, he and two other prisoners
00:58attacked Arthur Dade, a black man serving time for armed robbery, and O'Neill fatally stabbed
01:03him with a homemade ice pick. He was ultimately convicted of capital murder for the attack,
01:07and executed by lethal injection.
01:10Wyatt Busby
01:11Busby is seven years into a 50-year sentence for murder,
01:15and has a lengthy history of violent convictions.
01:17Wyatt Busby was convicted of murder for the fatal stabbing of a man in Houston,
01:21Texas back in 2016. He received a 50-year sentence, and was serving his term at the
01:26Coffield Unit in Texas. While there, Busby shared a cell with suspected serial killer
01:31Billy Shamirmeier. Between 2016 and 2018, Shamirmeier allegedly murdered at least
01:3618 women in Dallas, and was convicted of two of those killings.
01:40It took years to uncover the murders, because the deaths were not considered
01:44suspicious at the time due to the age of the victims.
01:47On September 19, 2023, the two cellmates got into a verbal confrontation, which escalated
01:53into a physical altercation after Shamirmeier reportedly made inappropriate comments about
01:58Busby's children. Prison guards were seemingly slow to intervene, allowing the situation to
02:03spiral out of control. By the time the two men were separated, Busby had killed Shamirmeier.
02:08Those who wanted justice for their loved ones don't feel sorry for the convicted serial killer.
02:13Sunil Rati
02:15Indian gangster Sunil Rati stumbled into a life of crime after his father's murder in 1999.
02:20Three people were accused of the killing, and within six months, Rati had tracked down and
02:25killed two of them, brothers Mehak and Mohkam Singh. These acts of retaliation landed him in
02:30prison for life. In 2018, Rati was transferred to the Baghpat District Jail after claiming his
02:35life was at risk at the previous facility. At Baghpat, he crossed paths with Munna Bajrangi,
02:41an infamous gang leader and contract killer with political ties. Bajrangi had reportedly made
02:46denigrating comments about Rati's appearance, which angered him. As a result, Rati fatally
02:51shot Bajrangi on July 9, 2018, using a gun he had smuggled into the jail.
02:57Kevin Robey
02:58If you watched the early films of director John Singleton, you might recognize actor
03:02Lloyd Avery II, who played gangsters in Boys in the Hood and Poetic Justice.
03:14The line between fiction and reality soon blurred as Avery became a real-life criminal,
03:19and received a life sentence in 2001 for a double homicide. Behind bars, Avery shared a cell with
03:24Kevin Robey, who was also serving a life sentence for sexually assaulting and murdering his sister.
03:29While Avery appeared to embrace a new path in prison, becoming a born-again Christian,
03:34Robey turned to Satanism. On September 4, 2005, Robey murdered Avery in what he claimed was a
03:40satanic ritual. Shockingly, prison guards did not discover Avery's body until two days later.
03:46Joseph Druce
03:47Reverend John Gagin was a central figure in the Catholic Church's sexual misconduct scandal in
03:52Boston. Gagin was accused of inappropriate conduct with nearly 150 youths over a 30-year period.
03:58Ultimately, he was convicted of indecent assault and battery, and sentenced to 9 to 10 years behind
04:04bars. In prison, Gagin met Joseph Druce, a fellow inmate serving a life sentence for murdering a
04:16man who allegedly made unwanted sexual advances at him. Druce was reportedly a victim of sexual
04:21misconduct in his childhood, and was said to be outraged by Gagin's apparent lack of remorse.
04:26On August 23, 2003, Druce attacked and killed Gagin in his cell.
04:35Although he pleaded not guilty by reason of insanity, Druce was ultimately convicted
04:40of first-degree murder. Jimmy Mack
04:50The death row section of prisons holds some of the most dangerous individuals in existence.
04:54In 1999, Donald Leroy Evans and Jimmy Mack were among those housed on death row at Mississippi
05:00State Penitentiary. Evans was a notorious serial killer who is believed to have claimed up to 70
05:10victims, although the exact number remains unknown. He was sentenced to death in 1993 for
05:15the sexual assault and murder of a minor. Evans has killed 72 people during the 1970s and 80s.
05:21He even led the FBI on a two-day search for bodies in the Arizona desert, but they found
05:26nothing. Mack, on the other hand, landed on death row for the 1990 murder of a man in Bolivar County,
05:31Mississippi. In January 1999, Mack attacked Evans with a shank, fatally stabbing him while he was
05:37leaving the shower area. He was convicted of manslaughter and received an additional 20 years
05:41to his sentence. Victor Castigador Dubbed the Killer from Manila, Victor Castigador was imprisoned
05:48in 1989 for the murders of two security guards in London. The crime, infamously referred to as the
05:54Human Torch Murders, earned Castigador a whole life sentence, essentially ensuring he would never
05:59be released. Among his fellow inmates at Long Larton Prison was Sidonio Teixeira, who was also
06:04serving a whole life sentence for killing his daughter and attempting to murder his son.
06:08While little is known about their relationship in prison, things came to a head in June 2016
06:13when Castigador fatally attacked Teixeira with a rock inside a sock during a workshop. Castigador
06:19was handed another whole life sentence and transferred to a top security prison, where he
06:23died in March 2017. Vincent Faustino Rivera The murders that took Vincent Faustino Rivera to
06:30prison occurred in Tampa, Florida in 1990. Rivera was convicted of killing two people just 10 days
06:36apart and sentenced to life at the Florida State Prison. Also incarcerated there was Gerard John
06:41otherwise known as the Killer Cop.
06:51A former sheriff's deputy, Schaeffer gained notoriety in the early 70s for the murder of
06:55two girls. Although he became a prime suspect in over 20 additional killings, he was only convicted
07:01of those two. In 1995, Rivera and Schaeffer reportedly argued over a cup of hot water,
07:07which resulted in Rivera fatally stabbing Schaeffer in his cell.
07:11However, rumors suggest that the murder was likely a targeted hit due to Schaeffer's reputation as a prison informant.
07:26In 1988, Rigoberto Sanchez Velasco stood trial for the murder of his girlfriend's
07:31daughter two years earlier. He had confessed to the crime shortly after it occurred,
07:35only to later recant. Nevertheless, he was found guilty and sentenced to death.
07:39But Sanchez Velasco never seemed to change his ways, even as he sat on death row. In 1995,
07:46he and another prisoner, Mario Lara, attacked two fellow death row inmates,
07:50Edwin B. Caprat III and Charles Street in the yard, in full view of prison guards and other
07:55witnesses. Both men later succumbed to their injuries. This violent act earned Sanchez
08:00Velasco two additional 15-year sentences. In October 2002, he was executed by lethal
08:06injection for his initial crime. Before we continue, be sure to subscribe to our channel
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08:20and switch on notifications. Christopher Scarver
08:25Do you remember when you learned that your father murdered Jeffrey Dahmer?
08:30Yes. It was about 10, I saw it on TV.
08:36One of the most notorious serial killers in history was Jeffrey Dahmer,
08:39who claimed 17 victims over a 13-year period and was sentenced to 16 life terms.
08:45People tried to understand how this could have happened in their midst.
08:49How did Jeffrey Dahmer get away with murder after murder for 13 years?
08:54Dahmer was imprisoned at the Columbia Correctional Institution in Wisconsin,
08:58which also housed Christopher Scarver. Scarver was serving a life sentence for the 1990 murder
09:03of a man during an armed robbery. Dahmer and Scarver worked together in the prison gymnasium
09:08alongside Jesse Anderson, who was convicted of murdering his wife. While cleaning the gym on
09:13November 28, 1994, all three got into a heated argument that culminated in Scarver killing both
09:19Dahmer and Anderson with a metal bar. He received two more life sentences for these murders and was
09:24subsequently placed in solitary confinement. What other killers never changed their spots
09:29even behind bars? Let us know in the comments below.
09:31And I mean, so, so be it.