>> we just didn't know if we at that moment had enough evidence to convict him. >> reporter: they just had to figure out where the evidence might be. >> did you think that eric williams had a hiding place? >> we began to suspect pretty early on if it's eric williams and we know what cars were used there may be a storage unit or some secret storage place that he may have access to that we haven't found. >> reporter: at least now, 10 weeks after hasse's murder, the investigation was finally on a roll. >> we go home that night to get a good night's sleep and i actually wanted for the first time in weeks to see my son play a little league game. >> reporter: but the next morning, his parenting plans were dashed by work again. his phone rang. it was a friend of eric williams, who'd heard about his arrest. >> and said, "mr. wirskye, i have something to tell you about eric williams. i think i may have rented him a storage unit." >> we'd been looking for a storage unit and i could tell when i listened to his voice, "this is it. this is the real thing." >> little league was out for the day? >> unfortunately, it was. little league was out. my son went three for three. >> but you were headed to a