He’s broke living off some stripper named Shrimp. No car. KM comes to him and says I’ve got $100k to be split between us if you take care of this problem for a rich lady that is having problems with her bad bad husband. He goes to his bff King Tato, top dog of the Latin Kings and tells him he’ll split it with him. Remember Rivera was gonna be the shooter. SG came to him and said ‘I have a job for you.’ Rivera backs out. KM likely puts the pressure on SG, manipulated him further, pushed all the buttons, prob promised to get back with him like Rivera said. So SG goes and does the murder himself.