. >> reporter: it was the end of a long overnight shift for sheriff's deputy marty wonderlin, the onlyeputy on duty in wapello county, iowa. all was quiet and with the first hint of daybreak that saturday morning, marty relaxed and turned up the music in his cruiser. >> reporter: it's the ragged end of the shift for you, huh? >> yeah, i'm taking my last little loop around the county and going to watch the sun come up and go home and go to bed. >> reporter: that plan came to an abrupt end around 5:30 a.m., when seth techel made a desperate 911 call from his house. >> she's been shot. i'm going to [ bleep ] kill who -- i was getting ready for work and i heard a gunshot and i came running out and she was shot in the side. >> reporter: dispatch relayed the message to marty wonderlin. the young deputy had never gotten a call like this. >> i have a report of a lady not breathing. i have now been advised this lady's just been shot. >> reporter: is your heart pounding a little? >> oh, yeah. that's an understatement. >> reporter: with his car and his mind both doing 90, marty raced to the house