The private company that provides security guards to the Metropolitan Transit System in San Diego, including the armed guard who helped hold down a handcuffed Angel Zapata Hernandez in a fatal encounter in October 2019, is being sued in Sacramento federal court for a similar death. That death, where a trio of guards handcuffed and restrained Mario Matthews inside Golden 1 Arena, occurred in July 2019, less than four months before Zapata Hernandez died on an MTS platform near the Santa Fe Depot. In both cases, the men were held down for an extended period by security guards employed by Allied Universal â nine minutes in San Diego, some 20 minutes in Sacramento. And both Matthews and Zapata Hernandez had a guard kneeling on their necks as they lay handcuffed and face down â Matthews for four minutes, Zapata Hernandez for six minutes.