the prosecution read a day planner entry from leuthold's wife saying, "i know you want me dead.nt to humiliate me by running around with a 20-year-old?" >> he couldn't start his life with her until he ended denise's. >> reporter: on the stand 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. [ speaking a foreign language ] >> translator: could be. >> reporter: leuthold has pleaded not guilty to first degree murder charges. if convicted, he faces 45 years in prison. the defense says the evidence isn't there, but prosecutors say the relationship he had with the college student was much more than just a sponsored student. >> i know, reena, you'll be following it. thank you. >> meantime, let's turn to ron for another update of the morning's top story. >> good morning, everyone. we begin in ukraine and the outrage over international investigators being blocked from the site where the malaysian airliner crashed and burned. this

. >> authorities in illinois say nathan leuthold, a former baptist missionary, shot his wife to makefor 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. and when she turned 18, they sponsored her so she could study in the u.s. now, prosecutors are making the case she's the 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, aina dobilaite. >> the motive? his real vailen tine, their 20-year-old lithuanian sponsor student. >> reporter: leuthold called police hat his dese, was shot n the head during a home invasion while he was out running errands, but prosecutors say he staged the whole thing. >> i observed some kitchen cabinets open and some k draws