he left the safe house briefly (to visit his mother) and returned to learn the ERP had already executed a man who was being held with [Roque] Dalton, Armando Arteaga. Hernandez then saw [Joaquin] Villalobos aim a gun at Dalton.
"He fired a shot, and he missed, and Dalton threw himself on a bed," Hernandez said. Dalton yelled back, "Don't kill," (No matés, in Central American Spanish), but Villalobos fired a second shot and killed the poet.
from Los Angeles Times: Secrets revealed in the death of Salvadoran poet Roque Dalton