Abdullah I. El-Amin, 40, learned his fate Monday following a six-day trial.
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Authorities say El-Amin shot Green back on September 28, 2020, while in his car.
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Green later died at the hospital.
Philadelphia's Office of LGBT Affairs identified Green as a member of the transgender community, calling the killing "a somber reminder of the epidemic of violence against trans individuals."
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El-Amin will be sentenced on November 4, 2022.
"Too often, violence against LGBTQ+ people, and Black trans women like Mia Green in particular, happens in the shadows because of societal marginalization. I'm gratified that the Philadelphia criminal legal system increasingly reflects Philadelphians' values of inclusion, and our city's abhorrence of discrimination and bigotry," said District Attorney Larry Krasner in a statement.