dr. wangler. xhaust from an engine in the garage to the bedroom where kathy wangler was sleeping. did you murder your wife, kathy? >> absolutely not. >> reporter: kill her with carbon monoxide? >> no. >> reporter: and dr. wangler's new wife, esther, is adamant he's innocent. are you living with a killer? >> no. you know, if i was living with the evil genius, i think i might be one of the first to know. >> reporter: this past march, dr. wangler was convicted of murder. and sentenced to 25 years to life in prison. >> and joining us now are dr. wangler's second wife esther and his son aaron. good morning to the both of you. >> good morning. >> i know watching that piece you're shaking your head a lot kind of in disbelief. if a jury was able to find you guilty as quickly as they did, how come you tend to think he's so innocent? >> there's a lot that didn't come out in the trial, chris. the prosecution was really interested in the truth, they would have tested the samples of kathy's lung tissue. first o