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TMZ.com reports that Zentil Vanzellas showed up to her Los Angeles home, scaring the 'We Found Love' singer at the time.
According to court records, Rihanna had reason to fear him, and Vanzellas was deemed a "credible threat". He plead no contest to allegations that he was harassing the pop star and was convicted of stalking Rihanna in 2010.
When contacted by TMZ, Vanzellas said he was "sorry" for the trouble he caused and would be staying away from the singer.
Calls to Rihanna's reps haven't been returned.Related Video: Rihanna's secret yacht date with Chris Brown?