(Portland, OR) -- Sentencing is scheduled next month for a man convicted of murder in the shooting death of a Gresham teenager five years ago. A Multnomah County jury found Isaac Bynum Jr. guilty Tuesday of second-degree murder for the fatal shooting of 17-year-old Seneca Alexander in 2021. Court records show Alexander gave Bynum a ride to a nearby store and then drove him back. That's when Bynum got out, walked around the car and fired 13 rounds into the vehicle, killing Alexander.