Alexis Guevara was a 20-year-old Hispanic man who was fatally shot on August 13, 2014, outside the Dell Music Center in Fairmount Park, Philadelphia. He had been involved in an argument with another man during a concert that was intended to promote peace and reduce violence in the city.

William Greene was arrested and charged with second-degree murder, robbery, and multiple gun-related offenses. Jury deliberations in the case lasted about 2½ hours before returning a conviction of second-degree murder in April 2017; Greene was sentenced to life in prison without the possibility of parole. The shooting and its aftermath raised questions about violence at community events and the underlying issues those events aim to address.

Did anyone attend that concert or know Alexis Guevara and have information about what led up to the shooting?