Italian news agencies LaPresse and ANSA quoted lawyer Fabrizio Ballarini as saying that Rudy Guede’s release, planned for January 4, had been moved up a few weeks by a judge, and he was freed on Tuesday.
Guede had already been granted permission to leave prison during the day to work while he served his sentence for the murder of 21-year-old Ms Kercher.
The case in the university city of Perugia gained international notoriety after Ms Kercher’s American roommate, Amanda Knox, and Knox’s then-boyfriend were placed under suspicion.
Both were initially convicted, but Italy’s highest court threw out the convictions in 2015 after a series of flip-flop decisions.
Guede was originally convicted in a fast-track trial procedure. He has denied killing Ms Kercher.
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