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SAN FRANCISCO – Mail-bomb charges were filed in the case of a San Jose student killed when a robotic toy dog exploded. 

Anthony Chang, 30, of Las Vegas, Nev., and David Lien, 33, of Milpitas, have been charged with three counts, including mailing an explosive and conspiracy, according to the U.S. Attorney’s Office. Chang remains at large. 

Patrick Hsu, 18, a freshman from University of California, Santa Barbara, was killed February 10 on a visit home for the weekend when he put the batteries in a toy robotic dog he received in the mail. The toy was actually a bomb, and it exploded when the batteries caused it to detonate. 

Chang was previously married to Hsu’s sister, Wendy. An affidavit filed in the case by a U.S. Postal Inspector said Chang had threatened to harm her brother if Wendy Hsu ever left him. She filed for divorce in December 2000. 

The two men face a maximum penalty of death or life in prison if convicted.