Jackson and Martinez, members of the Spanish Gangster Disciples street gang, were walking with Shaw, who was a rival, when they headed into an alley, prosecutors said.



Witnesses said Jackson pulled out a revolver and shot Shaw once, according to prosecutors. Shaw tried to flee and collapsed on a sidewalk, prosecutors said.



Jackson handed the gun to Martinez, who stood over the unarmed Shaw and fired, prosecutors said. Martinez shot a second time at close range, prosecutors said.



Prosecutors said Jackson and Martinez were complying with orders from a high-ranking member of their gang to kill Shaw because he was a rival.