he killed brittany eldridge.lled his baby. >> those same argument has led to a mistrial before. incredibly when this jury got the case, it also came down to a lone hold-out. only this time the majority wanted to convict. we spoke to two jurors about their deliberations. the person who voted not guilty, who was not going to change their mind, what was their issue? >> we asked and the response that was made is i'm the smartest person in the room. >> yes. i have a ph.d. you guys are all ganging up on me. >> at that point it became a very hostile room and we decided to call it. >> after four long days, they were hopelessly deadlocked. another hung jury. >> you just wake up and you wonder why is this happening? you know, why is my baby sister not here? and why can people -- why can the people on the jury not see what i can see? >> our family can't keep going through these trials coming out with the same verdict. we can't do it. >> the family may not have to do it again. after six years and two trials, prosecutors said

the man brittany had recently divorced. terry eldridge. brittany was 17 years younger than terry.was only 22 when they got married. it wasn't long before their marriage was in trouble. >> really you started to fall apart because she was getting antsy and wanted to have a family and settle down and he was just out driving a truck all the time. you know, she just kind of felt like this is not right for me like it used to be. >> the final straw was when terry found out brittany was having an affair with her co-worker norman clark and was pregnant with his baby. given that basket of facts the police investigating brittany's murder knew it was time for a talk with her ex-husband. >> coming up, investigators uncover secrets from brittany's life. revealing recordings that race new suspicious. >> coming up -- >> he was e-mails lime like normal. and then as soon as i told him, everything changed like instantly. and normal had secrets of his own. >> how many women were you seeing at the time. >> maybe 15 to 20. >> when "deadly circumstances" continues. you always drive this slow? how did yo