A federal court jury found a Buffalo man guilty Friday of selling heroin.

The verdict means Alejandro Navarro-Gonzalez, 31, will face a mandatory minimum penalty of 20 years in prison when he is sentenced in September by U.S. District Judge Richard J. Arcara.

Assistant U.S. Attorney Mary Catherine Baumgarten, who prosecuted the case with Assistant U.S. Attorney Eric Opanga, said more than a kilogram of heroin was found in March of last year in a storage unit rented by the defendant.

Defense attorney John J. Molloy argued during the trial that, while his client did lease the unit, there was no proof that he was the one who put the heroin inside it.