(NEWSER) – Ronnie Smith was supposed to be headed home to America for the holidays this week. Instead, the 33-year-old chemistry teacher was shot dead while jogging in Libya this morning. Smith, a US citizen, had taught at the International School in Benghazi for a year and a half and was "very much loved," the school principal tells NBC News. Smith can be seen interacting with students on his Twitter feed: In the last exchange posted, an apparent student tweeted at him yesterday, "Knowing im getting 100% on my sci exam tomorrow makes me soo happy @ISBchem right?" He responded: "yep. I already recorded it. 10%."