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Jereh Lubrin, 29, Matthew Farris, 27, and Rafael Rodriguez, 27, from left, attend their preliminary hearing for murder and assault charges at the Santa Clara County Hall of Justice in San Jose, Calif., on Monday, Feb. 29, 2016. They are Santa Clara County correctional deputies who are accused of beating to death Michael Tyree, an inmate at the Santa Clara County Jail on Aug. 26, 2015, and also accused of beating inmate Juan Villa.   (Gary Reyes/Bay Area News Group)
Jereh Lubrin, 29, Matthew Farris, 27, and Rafael Rodriguez, 27, from left, attend their preliminary hearing for murder and assault charges at the Santa Clara County Hall of Justice in San Jose, Calif., on Monday, Feb. 29, 2016. They are Santa Clara County correctional deputies who are accused of beating to death Michael Tyree, an inmate at the Santa Clara County Jail on Aug. 26, 2015, and also accused of beating inmate Juan Villa. (Gary Reyes/Bay Area News Group)
David DeBolt, Oakland city hall reporter for the Bay Area News Group, is photographed for a Wordpress profile in Oakland, Calif., on Wednesday, July 27, 2016. (Anda Chu/Bay Area News Group)
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The most heinous crimes on the state’s list of convicted cops are some of the most notorious: 20 former officers turned up with murder convictions, from a hot-tub drowning to a jail-cell beating.

Blair Christopher Hall, a former San Bernardino police officer, was convicted of drowning his wife — who had an $800,000 life insurance policy — in the couple’s backyard hot tub.

Former Los Angeles detective Stephanie Lazarus was found guilty of the 26-year-old murder of the wife of her former lover in a case that hinged on a single piece of evidence DNA from a bite mark on the victim’s arm. (AP Photo/Nick Ut, File) 

New DNA technology and the discovery of a skull with a bullet hole buried in a lake bed helped convict former Placer County Sheriff’s Sgt. Paul Kovacich of his wife’s murder 26 years after she disappeared.

LAPD detectives took down one of their own, Stephanie Lazarus, whose killing of an ex-lover’s wife went unsolved for 23 years. Dayle William Long, a Riverside County Sheriff’s deputy, was drunk and angry off-duty when he pulled his gun on a 36-year-old man during an argument inside a bar. Prosecutors said the man held his hands up in a “position of surrender” but Long shot him four times. 

California Highway Patrol Officer Tomiekia Johnson is serving 50 years to life for murdering her husband. At trial, Johnson maintained she grabbed the gun from her purse fearing her husband would grab it first and it accidentally discharged.

In a rare prosecution of an on-duty killing, Santa Clara County jail deputies Jereh Lubrin, Matt Farris and Rafael Rodriguez were convicted of second-degree murder for beating an inmate to death in 2015.

Johannes Mehserle, left, with his attorney Christopher Miller in Jan. 14, 2009, during a pretrial court hearing in his trial for the New Year’s day shooting of an unarmed man on an Oakland train platform. (AP file photo/Cathleen Allison) 

Bay Area Rapid Transit police Officer Johannes Mehserle’s killing of Oscar Grant, an unarmed 22-year-old African-American, as Grant lay on a station platform, sparked protests. Mehserle claimed he meant to fire his Taser; not his gun. Prosecutors charged him with second-degree murder but a jury in Los Angeles convicted him of involuntary manslaughter, which brought more unrest to Oakland streets. He was released from jail after 11 months and never returned to law enforcement.

But the man who could turn out to be California’s most notorious criminal cop is still awaiting trial: Joseph DeAngelo, suspected of being none other than the Golden State Killer, is charged in a dozen murders and more than 40 rapes — some during his time in the late 1970s as a cop for the Auburn Police Department near Sacramento.

Joseph James DeAngelo, the suspected “Golden State Killer”, appears in court for his arraignment on April 27, 2018 in Sacramento. DeAngelo, a 72-year-old former police officer, is believed to have killed at least 12 people, raped over 45 women and burglarized hundreds of homes throughout California in the 1970s and 1980s. (Photo by Justin Sullivan/Getty Images) 

This story is part of a collaboration of news organizations throughout California coordinated by the Investigative Reporting Program at UC Berkeley and the Bay Area News Group. Reporters participated from more than 30 newsrooms, including MediaNews Group, McClatchy, USA Today Network, Voice of San Diego, and Reveal from the Center for Investigative Reporting. Click here to read more about the project. Email us at cacriminalcops@gmail.com.