Shamal Thompson, 22, fresh off a meal at a nearby Checkers fast-food restaurant, wandered in under the pretense of shopping for condos in the luxury building that boasts private elevators, around-the-clock security and skyline-view homes that cost as much as $2.5 million.Calle undoubtedly thought she was seizing on an opportunity to sell her condo. But it was Thompson, police say, who was looking for opportunity.Early Thursday morning, authorities arrested Thompson and charged him with beating Calle to death as she showed him around her penthouse condo. After the killing, and after he went on a spending spree with Calle’s credit...