Israel Keyes, who admitted killing eight people before taking his own life in
December in an Alaska jail, has been tied to 11 killings, the FBI said Monday.
Agents are now trying to determine if Keyes' killing spree continued while he was out of the country, CNN reported. He is known to have been in Belize, Canada and Mexico.
"Keyes traveled internationally and it is unknown if he committed any homicides while outside of the United States," the FBI said in a statement that asked for information on his movements.
The four-page note Keyes left when he killed himself at the age of 34 gave few details about his crimes and expressed no remorse. But the FBI said an analysis of statements he made after his arrest led them to increase the death toll.
Keyes, who studied other serial killers, is believed to have committed crimes across the country, including a couple in Vermont in 2011. His last known victim, Samantha Koenig, a barista in an Anchorage coffee house, died in 2012.
Keyes, who had been using Koenig's debit card, was arrested in Texas and extradited to Anchorage. After his death, investigators found two caches he had created with equipment to kill and to dispose of bodies, one in Alaska and the other in the Adirondack region of New York.
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