Louis Machado, 31, who has twice been convicted of shooting a 16-year-old girl to death in 2000, was sentenced Monday to 18 years in prison by Pima County Superior Court Judge Howard Fell.

On Oct. 25, 2000, Rebecca Ramsay was walking up to her east-side home after attending a church-sponsored pizza party when she was shot and killed.

Police identified Machado as a suspect in 2001, but he wasn't charged until 2006. Machado was convicted of second-degree murder during a February 2008 trial. The conviction was overturned on appeal because Judge Frank Dawley should not have limited evidence linking a second man to Ramsay's death.

Machado was convicted of manslaughter during a second trial in late January.

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