FILE - This undated file photo provided by the Ector County Texas Sheriff's Office shows Samuel Little. The FBI says 78-year-old Little, who has confessed to some 90 killings nationwide spanning nearly four decades, offered his confessions as a bargaining chip to be moved from a California prison. Authorities say Little is in poor health and will likely stay in jail in Texas until his death. (Ector County Texas Sheriff's Office via AP)

Mikhail Popkov looks through bars during a court session in Irkutsk, Russia, Monday, Dec. 10, 2018. A court in Russia's eastern Siberia on Monday convicted Popkov, a former policeman of murdering 56 women, bringing the number he is believed to have killed to at least 78. (Julia Pykhalova, Komsomolskaya Pravda via AP)

FILE - In this Sept. 18, 2018, file photo, dozens of family members and friends of four women who authorities say were killed by a U.S. Border Patrol agent Juan David Ortiz, gather for a candlelight vigil at a park in downtown Laredo, Texas. The Border Patrol sector in Laredo, Texas, where two agents were accused this year of multiple murders in separate cases, disciplined employees more over two years than any other major sector, according to data released by U.S. Customs and Border Protection Friday. (AP Photo/Susan Montoya Bryan, File)

Law enforcement officers gather near the scene where the body of a woman was found near Interstate 35 north of Laredo, Texas on Saturday, Sept. 15, 2018. A U.S. Border Patrol agent suspected of killing four women was arrested early Saturday after a fifth woman who had been abducted managed to escape from him and notify authorities, law enforcement officials said, describing the agent as a "serial killer." (Danny Zaragoza/The Laredo Morning Times via AP)

FILE - This undated file photo provided by the San Mateo County Sheriff's Office shows Rodney Halbower. Halbower, a career criminal who authorities believe is a serial killer dubbed the Gypsy Hill Killer, faces trial Friday, Sept. 7, 2018, in Northern California for the murders of two young women four decades ago. Law enforcement officials believe Halbower raped and killed six young women during a five-month period in 1976. Opening statements start Friday in Redwood City, California about 30 miles (50 kilometers) south of San Francisco. (AP Photo/San Mateo County Sheriff's Office, File)

FILE - In this June 1, 2018, file pool photo, Joseph James DeAngelo appears in Sacramento Superior Court, in Sacramento, Calif. DeAngelo, accused of being Golden State Killer will be tried in Sacramento County on more than a dozen murders committed up and down the state that terrorized residents during the 1970s and '80s. Orange County District Attorney Tony Rackauckas says Sacramento County was chosen due to the complexity of the case, consideration of the suspect's rights, the locations of the crimes and the hardship of victims and witnesses. He said at a press conference Tuesday, Aug. 21, 2018, that six jurisdictions had been considered.(Jose Luis Villegas/The Sacramento Bee via AP, Pool, File)

(Paul Kitagaki Jr./The Sacramento Bee via AP, Pool, File)

Residents attend a candlelight vigil at St. John the Evangelist Anglican Church, in Fredericton, New Brunswick, Canada, on Friday, Aug. 10, 2018. Two city police officers were among four people who died in a shooting in a residential area on the city's north side. (Andrew Vaughan/The Canadian Press via AP)

Police and RCMP officers survey the area of a shooting in Fredericton, New Brunswick, Canada on Friday, Aug. 10, 2018. Fredericton police say two officers were among four people who died in a shooting Friday in a residential area on the city's north side. One person was in custody, they said, and there was no further threat to the public. (Keith Minchin/The Canadian Press via AP)