few words with ates' sister brenda that night. she told them that her brother had arrived at their moms in louisiana that tuesday evening, one day before the murder of paul duncsak. >> did you think she was telling the truth? >> i wasn't certain. it was still very early on in the investigation. >> so the detectives kept look at the ates' family's possible involvement in the murder. roughly a month after the crime, they obtained wiretaps on various ates phone lines. what they heard sounded to them like a classic cover-up in the works. ed ates tried to make sure his family stayed on script when it came to the tuesday story, his alibi. >> you were there when i got there on tuesday. >> yes, right. >> okay. i've just got to make sure we're all saying the same thing when it comes to it. >> at least one of them is ed ates forcing his alibi on his sister, basically saying i got there on tuesday. >> coaching his story. >> yes. >> the detectives were also