A California mother of two has been found dead and her ex-husband was arrested as the main suspect – three days after she vanished and a “significant amount of blood” was found inside her home, police said. Rachel Castillo, 25, was last seen early Thursday by her sister, Emily Castillo, whom she lived with along with her two young sons, ages 2 and 5. Police launched a desperate search for the missing woman after saying they found “a significant amount of blood” at the Simi Valley home. “Detectives located human remains of an adult female in a remote location within the Antelope Valley,” police said in a statement late Sunday. The remains have been identified as those of Castillo, police said. “The primary suspect in this case, is Rachel’s ex-husband, 25-year-old City of Hawthorne resident, Zarbab Ali. Mr. Ali was arrested, this afternoon at his parent’s home in Victorville, in connection to Rachel’s homicide,” the statement said.