Missing Person The Hackettstown Police Department seeks the public's help in locating a missing person: Mylene Danielle Clark,15, H, F, 4'08, 115lbs, Brown eyes, Black hair. Last seen, on 12/6/18 at approx 4:30 a.m., at her residence on Fifth St in Hackettstown, NJ. She was last seen wearing white Nike sneakers with black stripes and possibly has a silver/purple backpack.