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Liu was a security guard of Los Angeles Chinese Consulate on duty during Day 4.

After Jack Bauer covertly raided the consulate and took Lee Jong, a key witness in finding the terrorist mastermind Habib Marwan and stopping a nuclear warhead, the guards detected him and began to find him. Some guards shouted for Liu to come to their position. As Jack were escaping the consulate, the guards started to fire at him. In the process, Lee was injured and the Chinese consul Koo Yin, was killed by friendly fire.