MEXICO CITY — Julio César Chávez Jr., whose high-profile boxing career was marred by substance abuse and other struggles and never approached the heights of his legendary father, was in Mexican custody Tuesday after being deported from the United States.

His expulsion had been expected since July, when Immigration and Customs Enforcement arrested him outside his Los Angeles home and accused him of making “fraudulent statements” on his application to become a U.S. permanent resident.

In Mexico, Chávez, 39, faces charges of organized crime affiliation and arms trafficking, Mexican authorities say.

He is the son of Julio César Chávez — widely regarded as Mexico’s greatest boxer — and spent his career in the shadow of his fabled father.

His father both supported his troubled son and chasti

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