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Investigators seek answers when a prosecutor and a district attorney and his wife are murdered within a couple of months of each other.

>> right, and some of these teams had 25, 30 people on them. and there was a team that looked at all of the victims and what they may have in common. >> they believed the killing of d.a. mike mcclelland was linked with the shooting of prosecutor mark hasse back in january. but it was all one big collective hunch, until a tip came through that would confirm the connection. >> through the crime stoppers web-based tip line, we get a tip that claims credit for the mark hasse murders. >> the electronic message came in easter sunday night. it began, "do we have your full attention now?" "we" suggest...

That's because the system is set up to protect the anonymity of all tipsters. when a message comes in, the sender is identified only by a unique number. after 12 hours of nail-biting, there was finally a response that told investigators this person was the real deal. mark hasse was killed with .38-caliber ammunition fired from a .357 five-shot revolver. would anyone other than the killer have known that? >> no. this person knew way more than anybody would have. >> the killer also wrote, "your act of good faith will result in no other attacks this week." in return for that pledge, the killer ma...

>> we just didn't know if we had enough evidence to convict him. >> 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. >> at least now, ten 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 lit...

Investigators seek answers when a prosecutor and a district attorney and his wife are murdered within a couple of months of each other.