We are learning more information about the new case against Charlie Tan. According to court papers, Tan persuaded his friend, Whitney Knickerbocker, to buy him a shotgun because he wanted to use it for hunting. Tan was charged with killing his father with the gun. That charge was dropped after a hung jury. Tan will face trial later this month on federal gun charges. Video from a Walmart in Cortland shows Tan and Knickerbocker buying the shotgun in February 2015. The paperwork says Tan gave Knickerbocker a case of beer in exchange. Tan was unable to buy the gun because he is a Canadian citizen.