Killer who fatally stabbed 4 University of Idaho students still at large; victim had posted she was "one lucky girl" hours before death

The killer - or killers - who stabbed four University of Idaho students to death remained at large early Wednesday, prompting many students to leave the campus in the idyllic small town despite police assurances that there was no imminent risk to the community. Meanwhile, photos and messages on Instagram show the four as close-knit, longstanding friends, with one victim recently writing she was "one lucky girl to be surrounded by these people." 

Many students had left the scenic tree-lined campus in Moscow, Idaho, by Tuesday.  A vigil for the slain students set for this week was postponed until after the school's fall break next week, University of Idaho spokesman Kyle Pfannenstiel told CBS News on Tuesday.

The students, all close friends, were found dead in an off-campus rental home around noon on Sunday, and officials said they likely were killed several hours earlier. Latah County Coroner Cathy Mabbutt told the Spokane, Washington-based television station KXLY that her preliminary investigation showed the students were stabbed to death. There is no indication that substance use was involved in the deaths, Mabbutt said.