After being taken in by Courtney Matthews (the half-sister of Sonny Corinthos), Diego began acting out with Brook Lynn Ashton. Eventually he found out his father was crime boss and arms dealer Lorenzo Alcazar. Alcazar had slept with Diego's mother Maria Sanchez, who Diego grew up believing was his sister. Maria arranged for Diego to go into foster care when she found out she was about to be deported. Diego began living with his father and following in his crime boss footsteps. After months of not doing much, when Kirsten Storms joined the show in May 2005 as the new Maxie Jones, Diego took a liking to her and broke up with his current girlfriend, Brook Lynn. He turned out to be the PCU stalker who had been drugging girls and taking pictures of them, including Maxie and Brook. He claimed he