looks like most of the drivers would be returning by morning after a response they got to a bid that wempblng live at sfo, nbc bay area news. >>> another -- aid worker peter kassig's death took place just a year after he was taken prisoner. there were expressionings of con dpem nation from his family, there is hope that their 26-year-old son will be remembered for the good he was trying to do. richard engel has more. >> reporter: peter kassig made it his life's work to help others but paid for that selflessness with his own life. today president obama called his murder an act of pure evil by a terrorist group that the world rightly associates with inhumanity. the 26-year-old former army ranger from indiana who served in iraq travelled to syria last year to volunteer as a medic. while delivering supplies, isis militants stopped him at a checkpoint and kidnapped him. he converted to islam reportedly endured torture. he knew hiss time would come. last month, kassig's father ed read a letter written to the family by their son. >> don't worry dad, if i go down, i won't go down thinking anything