Investigator

In Detective Kaiser's account, Diane seemed to be struggling a little bit with the nature of her husband's relationship to the man or what they did during their time together.

Kaiser said Diane told her that when she learned of the relationship after discovering that email, she and Bob discussed it, but they never argued.

Kaiser said Diane told her that when she learned of the relationship after discovering that email, she and Bob discussed it, but they never argued.

But she laid her foot down. She gave him an ultimatum. You are not to see this guy anymore.

But she laid her foot down. She gave him an ultimatum. You are not to see this guy anymore.

As far as you know, did Bob adhere to that ultimatum?

As far as you know, did Bob adhere to that ultimatum?

Diane Eidman finds herself sitting in a polygraph room at the St. Charles Police Department.

Diane Eidman finds herself sitting in a polygraph room at the St. Charles Police Department.

Adding to investigators' frustration, a day after Diane takes that polygraph test, the clock expires. The major case squad is out of there. 37 officers, 15 different departments had spent more than 2,500 man hours investigating with no arrests. A frustrating end to a furious search for answers.

Adding to investigators' frustration, a day after Diane takes that polygraph test, the clock expires. The major case squad is out of there. 37 officers, 15 different departments had spent more than 2,500 man hours investigating with no arrests. A frustrating end to a furious search for answers.

The task of solving the murder of Bob Eidman now falls to a junior detective in the department, Don Stepp.

The task of solving the murder of Bob Eidman now falls to a junior detective in the department, Don Stepp.

Detective Stepp continues to immerse himself in the details of the case. It had been over a year since Bob Eidman was murdered when Stepp is at the airport in St. Louis and he spots Diane.

Detective Stepp continues to immerse himself in the details of the case. It had been over a year since Bob Eidman was murdered when Stepp is at the airport in St. Louis and he spots Diane.

Despite the time that had passed, Diane had never fallen off of Stepp's radar. Diane Eidman knows that you're keeping a close eye on her, doesn't she? Yes, sir, she does. How would you characterize the look on her face when she saw you?

Despite the time that had passed, Diane had never fallen off of Stepp's radar. Diane Eidman knows that you're keeping a close eye on her, doesn't she? Yes, sir, she does. How would you characterize the look on her face when she saw you?

It is 2009. And Diane Eidman is spotted at the airport in St. Louis by Detective Don Stepp. How would you characterize the look on her face when she saw you? Shock. Stepp documents the incident, later learns that Diane took a trip to Las Vegas. But nothing comes of it.

It is 2009. And Diane Eidman is spotted at the airport in St. Louis by Detective Don Stepp. How would you characterize the look on her face when she saw you? Shock. Stepp documents the incident, later learns that Diane took a trip to Las Vegas. But nothing comes of it.

Face it, there are few, if any, solid leads to pursue, including the identity of that mystery driver whose car was seen on the day of the murder.