According to the California Department of Corrections and Rehabilitation (CDCR) death row list, 737 inmates are being granting temporary reprieves through this executive order, which is the largest in the nation.
"I do not believe that a civilized society can claim to be a leader in the world as long as its government continues to sanction the premeditated and discriminatory execution of its people", he said in a statement issued with the executive order.
She continued: "I have met with and am very supportive of Governor Newsom and his decision to help bring an end to the California Death Penalty".
A quarter of all those on death row in the United States are in California, according to the governor's office.
California voters have, more than once, affirmed their desire for a death penalty. "It has provided no public safety benefit or value as a deterrent". However, he said prohibiting corrections officials from preparing to carry out executions "is patently illegal" under the 2016 ballot measure. Twenty-four people now on California's death row were convicted of murder and have exhausted all of their appeals, the Times reported. Since the 1970s, 79 death row inmates have died of natural causes in the state and 26 by suicide.
Governor Newsom's office also stated that 25 inmates now on death row could have possibly faced execution if the new lethal injection method had managed to pass the courts.
While Newsom's gesture may impress an increasingly left-wing Democratic Party base, it is sure to be controversial on both sides of the aisle.
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California is the sixth state where a governor has enacted a moratorium.
The moratorium on the death penalty will last as long as Newsom holds office.
The order calls for the immediate closure of the execution chamber at San Quentin Prison.
At that time, Newsom said he understood that the issue "raises deeply felt passions on all sides" but he believed that Americans ultimately would look back on the death penalty "as an archaic mistake". "But most of all, the death penalty is absolute, irreversible and irreparable in the event of human error".
Murder Scott Peterson is amongst those on death row. Republican Illinois Gov. George Ryan was the first to do so in 2000, though Illinois has since abolished the death penalty.
The third main angle of Newsom's argument is that the death penalty is "costly and burdensome", costing the state $5 billion since 1978.
Brown had focused on sweeping changes to criminal penalties and reducing the prison population. California voters previously rejected an initiative to abolish capital punishment in the state and instead, in 2016, voted in favor of Proposition 66 to help speed up executions.
Kim Kardashian is speaking out to voice her support for ending the death penalty.