No one seems to know what happened to Vicente Ventura Aguilar. A witness told his brother and attorneys that the 44-year-old Mexican immigrant, who doesn't have lawful immigration status, was taken into custody by immigration authorities on Oct. 7 in SouthLosAngeles and suffered a medical emergency. But it's been more than six weeks since then, and Ventura Aguilar's family still hasn't heard from him. The Department of Homeland Security said 73 people from Mexico were arrested in the Los Angeles area between Oct. 7 and 8.