international school in benghazi, was gun down yesterday morning. smith was in libya living with his wife and young son. why he was killed is still unknown but he is now the fifth american to be murdered in benghazi in the last year or so after ambassador chris stephens and three others were killed there in september 2012. nic robertson is following the story and has the latest. >> reporter: ronnie smith was shot down from a passing car as he was out jogging. he never stood a chance. a chemistry teacher at an international school in libya's city of benghazi, he knew the dangers. tweeting this two months ago. libya islamists are threatening kidnappings. but smith wasn't afraid. the tweet continues, as if they can fit kidnapping into a two-hour workday that already includes a nap. losers. in this video made for his texas church as he leaves for libya with his wife 18 months ago, he explains why he can handle the