The murder occurred during the afternoon of January 30, 2002, when he and his daughter were walking back to La Patria headquarters from their lunch together. He was shot in the head three times with a revolver at close range by Luis Frenando Soto Zapata who was detained shortly after the shooting along with Luis Arley Ortiz. Sierra was rushed to a hospital where he died on February 1, 2002.
Luis Frenando Soto Zapata
Luis Arley Ortiz