Mexican President Claudia Sheinbaum is preparing legal measures and demanding accountability after the killing of Lorenzo Salgado Araujo by an Immigration and Customs Enforcement officer in Houston.Harris County District Attorney Sean Teare says federal authorities are exclusively managing the probe while family members, civil rights groups and the League of United Latin American Citizens press for release of all footage and an independent inquiry.Family members and activists say Lorenzo Salgado Araujo had no criminal record, was pursuing legal residency and had been driving a crew to a construction site when agents intercepted him, and witnesses circulated video showing him bleeding and handcuffed.Advocates have offered a $5K reward for witnesses and footage, and they warn that three men detained after the encounter may be deported before they can testify, even as the Department of Homeland Security says it is investigating.