In April of 2006, Maine's sex offenders registry was taken down due to two registered offenders being killed within hours of each other. Police were able to track the murderer down before anymore people were killed, but the killings caused a lot of debate around the safety of registered offenders.

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Sources:
https://www.theglobeandmail.com/news/national/slaying-suspect-had-past-brush-with-violence/article707045/ 

https://murderpedia.org/male.M/m/marshall-stephen.htm 

http://archive.boston.com/news/local/maine/articles/2006/04/20/suspect_in_maine_slayings_had_strong_feelings_about_sex_offenders/ 

https://www.prisonlegalnews.org/news/2007/apr/15/two-registered-sex-offenders-murdered-in-maine/ 

https://www.npr.org/2006/04/21/5355980/murders-put-focus-on-sex-offender-registry-policies 

https://en.wikipedia.org/wiki/Murder_of_Megan_Kanka 

https://web.archive.org/web/20150925171319/http://www.independent.co.uk/news/world/americas/a-vigilantes-charter-the-bitter-legacy-of-megans-law-405254.html 

https://abcnews.go.com/US/story?id=1855771&page=1 

Ex Con "Helps Police" by Trying to Murder Sex Offenders | Prison Legal News

Prison death of sex offenders’ killer is investigated as a suicide | The Seattle Times

Man Charged in Killings of Sex Offenders - The New York Times (nytimes.com)