A death penalty dispute goes before Nevada’s Supreme Court today when justices hear arguments about how long a Salvadoran immigrant’s lawyers should have to prove he’s intellectually disabled and therefore can’t be executed if convicted of four murders. Wilber Ernesto Martinez-Guzman, 22, is scheduled to go to trial Sept. 20 for the fatal shootings and multiple burglaries during an 11-day crime rampage in Reno and rural Douglas County in January 2019.