At the top of that list is the loss of Alvarez's son Esai (played by Kevin Alejandro in Sons of Anarchy), and his desire to avenge his death. Esai was stabbed in the head by SAMCRO's Happy Lowman (David Labrava), the same killer who took out EZ's (JD Pardo) mom Marisol on the order of Dita Galindo (Ada Maris).