more than two years later, dave delaney is promoted from detective to chief deputy.h means his days investigating the halloween bank robbery in 2007 are about to come to an end. >> it could be very frustrating when you are working on a case, especially when it's something that high profile. once i knew i was getting promoted and not going to be in the office anymore it really made me want to try and solve that. we had a lot of success with clearing these bank robberies and for two years, the biggest dollar amount that i've worked with in a bank robbery, i wasn't able to do it. >> but these bank robbers are going to give delaney and the rest of the palos heights police department another chance. three thieves approach the same tcf bank with their guns concealed. instead of construction worker uniforms, they now wear hooded sweatshirts and ski masks. armed with a shotgun and two handguns, they enter the same door and again threaten the lives of employees and patrons. one man takes a teller to the vault while the other two stand guard. >> you can see them here. he's goi