(Rick Egan | The Salt Lake Tribune) Luciano Pena-Valencia, Bryan Pena-Valencia's son, poses with Mario Herrera at the memorial for Bryan Pena-Valencia on Saturday, March 20, 2021. Bryan Pena-Valencia was killed in March 2020 by Unified police officer Omar Flores. He was unarmed. Herrera filed a lawsuit on behalf of Bryan Pena-Valencia on Wednesday, May 5, 2021, alleging Flores unnecessarily used deadly force.