( CNN ) -- Confessed serial killer Israel Keyes was a murder addict who found great enjoyment in taking people 's lives , police say . `` Israel Keyes did n't kidnap and kill people because he was crazy , he did n't kidnap and kill people because his deity told him to or because he had a bad childhood . Israel Keyes did this because he got an immense amount of enjoyment out of it , much like an addict gets an immense amount of enjoyment out of drugs , '' said Anchorage , Alaska , police Detective Monique Doll at a news briefing . `` He was addicted to the feeling he got when he was doing this , addicted to the feel of the hunt and of killing , '' Doll said . Keyes killed the last of his known victims , Anchorage coffee stand barista Samantha Koenig , 18 , in February . He has confessed to killing at least seven other people : two in Vermont , four in Washington state , and one somewhere on the East Coast . He committed suicide in his Alaska jail cell earlier this month by slitting his wrist and strangling himself with bedding . Anchorage police and the FBI gave more details about their interviews with Keyes on Monday in hopes of generating new tips about his crimes . Police said that while he admitted eight murders , there may be at least three more , and that they need the public 's help in their investigations . `` We want people to know what kind of person this fellow was so they can help us connect dots and maybe generate connections between missing person cases and Israel Keyes , '' Anchorage police Chief Mark Mew said . Authorities played a chilling tape Monday in which Keyes talked about how he lay in wait at an Alaska park with a sniper 's rifle in hopes of killing a young couple who had parked there . He had his kill zone prepared , with drain cleaner and a shovel at the ready to dissolve and bury the body parts . `` I was gon na do my thing in the parking lot , '' Keyes said , but an Anchorage patrol officer showed up and checked on the couple . Keyes said he was prepared to kill the officer , too , but aborted his plan when another officer showed up . `` It could 've got ugly , but fortunately for the cop guy , '' he said with a chuckle , `` his backup showed up . '' `` I almost got myself into a lot of trouble on that one , '' Keyes said . `` As soon as his backup showed up I decided I better call it a night . '' The incident is indicative of the way Keyes saw himself . Doll described him as `` very matter of fact '' but comfortable with who he was . `` Israel Keyes never expressed in any way , shape or form that he was ashamed of or regretted his actions , '' Doll said . `` He knew what he was and he was fine with it . '' The Anchorage detective also said Keyes took pride `` in living this Dr. Jekyll-Mr. Hyde lifestyle , '' with neither family nor friends suspecting him . Doll said Keyes researched and read about , but did not emulate , other serial killers , including Ted Bundy , who killed as many as 40 people between 1974 and 1978 . `` He was very careful to say he had not patterned himself after any other serial killer , '' she said . `` His ideas were his own . ... That mattered a lot to him . '' Those ideas included careful planning and the ability to back off killing plans if variables changed the situation , such as a planned victim with a large dog , or a victim who did n't have a vehicle in which Keyes could evade authorities . Police said he broke his own rules in the abduction and killing of Koenig . He used her debit card to make an ATM withdrawal that eventually led police to him in Texas . Mew said Keyes started `` to be a bit compulsive toward the end . '' Anchorage police Officer Jeff Bell said Keyes ' end did not come as the killer thought it would . He envisioned being killed in a gun battle with police during a bank robbery , Bell said . Besides Koenig , whose body was found in a lake north of Anchorage , authorities have identified only two of Keyes ' other victims , Bill and Lorraine Currier of Essex Junction , Vermont . More clues may come from an illegible , blood-soaked note that was found in Keyes ' cell after his suicide . That is being analyzed at the FBI 's lab in Quantico , Virginia , Mews said , in hopes of determining what Keyes wrote . Authorities are asking that anyone who may have information about Keyes get in contact with the FBI at 1-800-CALL-FBI or call their local FBI office . Read more : Life sentence closes oldest cold case . Read more : Ex-cop convicted of nine murders to be executed . Raed more : Bodies identified as missing Iowa cousins .
Anchorage police release details on serial killer Israel Keyes . The suspect is accused of killing five people in Alaska between 1999 and 2001. Keyes took pride in being his own kind of serial killer , detective says . Keyes confessed to eight killings ; he committed suicide in his cell this month .