Details: Dennis Walker was a sports memorabilia collector who collected items belonging to Babe Ruth, Mickey Mantle, and Pete Rose, among others. His collection is valued at over $10 million. In June 1980, Walker started an investment company in his hometown of Medford, Oregon. He started grandiose investment schemes and even opened a bank on a south Pacific island. More than 140 people gave Walker several million dollars to invest over the years. Walker's employees trusted him and also invested with him. Walker bought rare and expensive sports memorabilia with his investor's money. He started with buying baseball cards but soon began buying rare expensive items. He leased a building in Medford and opened a sports memorabilia museum. He even had Pete Rose there as a special guest for the m