Kyla Joas, left, and Megan Seckler of Pi Beta Phi sorority raise a sky lantern outside Zimmerman Library on Tuesday evening. The launch came after the memorial service to celebrate the lives of UNM students Briana Hillard, a Pi Beta Phi sister, and Matthew Grant, a former Sigma Alpha Epsilon fraternity member. Hillard and Grant were killed and two more remain hospitalized after a hit-and-run car accident in front of Hotel Albuquerque on Friday night.