Valentine's Day Murder Trial Begins

Former Baptist missionary allegedly shot his wife to make room for another lover.
2:19 | 07/19/14

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Transcript for Valentine's Day Murder Trial Begins
But first the man on trial accused of killing his wife on Valenti Valentine's day. Authorities in Illinois say Nathan Leuthold shot his wife to make way for his alleged mistress. The prosecution and defense laying out their case in court and ABC's Reena ninan is here with more. Good morning, Reena. Reporter: Good morning to you guys. The couple met that alleged mistress when she was just a girl during a mission trip to Lithuania. When she turned 18 they spons sponsored her so she could study in the U.S. Prosecutors are making the case she's the reason Nathan Leuthold not only broke his wife's heart he murdered her on Valentine's day. This morning Nathan Leuthold is behind bars accused of murdering his wife on Valentine's day last year. Prosecutors say so he could be with his alleged mistress. Ina. The motive? His real Valentine. Reporter: Leuthold called to report his wife was shot in the head during a home invasion while he was out running ear's but prosecutors say he staged the whole thing. I observed some kitchen cabinets open and some kitchen drawers on the floor. I felt this was not an ordinary burglary. Reporter: According to police it was a Glock 40, the murder weapon, same type he himself owned but was missing and found internet searches for how to muffle a gun hitting someone over the had he had to knock them out and lethal injection. Other defense attorneys deny any affair. The prosecution read a day planner entry from Leuthold's wife saying I know you want me dead. Why do you want to humiliate me by running around with a 20-year-old? He couldn't start his life with her until he ended de nose's. Reporter: The alleged mistress questioned about a text message Leuthold sent her just 15 minutes after calling 911. To report his wife's murder. Do you remember texting back the word "Interesting" with a smiley face. Translator: Could be. Leuthold pleaded not guilty to first degree murder and if convicted he faces 45 years in prison. The defense says the evidence isn't there but prosecutors say the relationship he had with a college student was much more than just a sponsored student. I know you'll follow it. Thank you.

This transcript has been automatically generated and may not be 100% accurate.

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