Nathan Martinez is accused of killing a 17-year-old Julian Junior Robledo in a 2023 drive-by shooting that investigators linked through ballistic evidence to a separate shooting that left two men dead and five others wounded. Martinez faces a murder charge in the death of Julian Junior Robledo, he and his mother were shot at while sitting under their carport in August 2023. Julian Robledo died from his injuries two days later. His mother was not hurt, but a women inside the home was injured. SAPD said investigators found posts in which Martinez allegedly bragged about 'taking down a rival gang member' and described using a firearm modification known as a switch to make a weapon fully automatic. Martinez also faces a separate capital murder case stemming from a June 2022 shooting that killed two men and injured five other people. That case remains pending. On June 18, 2022, a family was gathered for a barbecue. Police say a dark-colored SUV drove past the home and opened fire, with an estimated 20 to 30 rounds fired. Two men, Alejandro Gomez-Soliz, 45, and Juan Gomez, 46, were killed. Five other people were wounded. A third shooting occurred in August 2023 at an apartment complex. Police said a victim returned fire after being shot at. Although the victim was not cooperative with police, investigators collected additional ballistic evidence. Investigators have said ballistic evidence, including matching shell casings, connected all three shootings. A trial date has not been scheduled yet for the capital murder case.