Benjamin Marcelo Guerrero-Cruz was walking his family’s dog in Van Nuys on a recent morning when he was taken into custody by federal immigration officials, according to authorities and published reports. Guerrero-Cruz, who turned 18 this month, was set to start his senior year at Reseda Charter High School on Thursday. Instead, he’s being held in Department of Homeland Security custody pending removal from the United States, the agency confirmed in statement to The Times on Friday. “Benjamin Guerrero-Cruz, an illegal alien from Chile, overstayed his visa by more than two years, abusing the Visa Waiver Program under which he...