According to the Boulder Daily Camera, the two were visiting New Zealand's renowned Waitomo Caves earlier this month when their vehicle was struck by a cement truck. Stithem, a CSU graduate, died at the scene, while Steinke was rushed to a nearby hospital for intensive care treatment so serious that her parents immediately flew to the country to provide support during this terrible time.
The Camera notes that the highway intersection where the accident took place has been the scene of tragedies before -- five crashes, two of them fatal, since 2009.
Here are photos of Steinke and Stithem from the past few years, during infinitely happier times.
Continue to see more photos of Kirsten Steinke and Kallan Stithem.More from our News archive: "Laura McDermott ID'd as victim in fatal Broadway and Cedar hit and run."