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Guerrero was last seen leaving his family's residence in Milwaukee, Wisconsin on March 24, 1988. He was on his way to a friend's house, but never arrived. He was carrying no identification and only $3 in cash at the time of his disappearance.
Authorities believe that Guerrero met serial murderer Jeffrey L. Dahmer sometime during the evening and returned to Dahmer's residence in West Allis, Wisconsin with him. A photo of Dahmer is posted below this case summary. Guerrero may have agreed to pose for photos for Dahmer during the evening as a way to earn additional money.
Dahmer was sentenced to life in prison for Guerrero's murder and other deaths in the early 1990s. He was killed in prison by a fellow inmate in 1994.