What brought Walter’s case to the attention of the EJI to begin with?

From the text:

I thought about how if Judge Robert E. Lee Key hadn't overridden the jury’s verdict of life imprisonment without parole and imposed the death penalty, which brought the case to our attention, Walter likely would have spent the rest of his life incarcerated and died in a prison cell.

C. The judge over-riding the jury’s verdict of life in prison and instead imposing the death penalty.