Aug. 13, 2013  -- Alaska serial killer Israel Keyes may have committed suicide in his jail cell, but authorities are still trying to make sense of the "tantalizing clues about other murders" Keyes left behind, the FBI said today.

Before his death last year, Keyes led investigators to believe he had killed at least 11 people.

The FBI has released an online package of information related to Keyes that includes hours of interrogation videos, photos and an interactive timeline that traces Keyes' known whereabouts from 1997-2012.

"He gave us a number of clues," FBI Anchorage Division Special Agent Jolene Goeden said in a statement today. "He talked openly about some of the homicides, but much of what he said only hinted at the things he had done. So we are trying to get information out there about what he did tell us."

Serial Killer Israel Keyes 'Broke His Own Rule,' Lost Control "We are letting the public know the types of cars he rented, towns he visited, campgrounds he frequented," Goeden said. "Anything that might spur someone's memory could help us."

The arrest of Keyes, 34, on March 12, 2012 for the murder of Alaskan barista Samantha Koenig ended more than a decade of traveling around the country to find victims to kill or to prepare for future crimes by burying murder kits of weapons, cash and tools to dispose of bodies. Since March he had been slowly telling police about his hidden life and how he operated. But the tale abruptly ended when Keyes committed suicide in his jail cell on Dec. 1.

Serial Killer Israel Keyes' Suicide Letter Is Creepy Ode to Murder

Since then, investigators have been trying to fill in the details of his vicious life. The FBI said that Keyes discussed "seven or eight other victims" in addition to the three, including Koenig, that have been definitively tied to him so far.

"If we have a missing person identified in a particular area, we work closely with that local police department to either connect the person to Keyes or not," Goeden said. "We have his DNA."

The FBI believes Keyes killed and buried a victim in upstate New York in April 2009. He also told them about killing a couple in Washington state sometime between July 2001 and 2005. He also told investigators about another victim in the Washington area and possibly others in surrounding states, Goeden said.

"Although he chose many of his victims randomly, a tremendous amount of planning went into these crimes," he said. "Keyes enjoyed what he did, and he had no remorse at all. He told us if he hadn't been caught he would have continued kidnapping and murdering people."

The FBI asked that if the videos or map trigger any memories or if people have any information regarding Keyes, please contact your local FBI office, call 1-800-CALL-FBI, or submit an online tip.

"That fact that Keyes is dead makes it more difficult for us, but the investigation absolutely continues," Goeden said.