Friday marked exactly three years since a 16-year old girl stepped off her school bus into oblivion.
Ali Lowitzer's parents observed the somber anniversary, releasing butterflies into the air alongside dozens of friends and neighbors in Spring.
Lowitzer was supposed to be headed to her after-school job on the afternoon of April 26, 2010, but she never showed up.
And while tips and leads have trickled in, none of them have led police - or Ali's parents - to the missing teen.
"We haven't found anything yet," said her father, John Lowitzer. "So there's still a chance, there's still a hope that she's out there. And that we will get that call one day, and she'll come home."
The Lowitzers say they will never stop looking for their daughter. The couple welcomes any and all clues, no matter how insignificant the information may seem. The family is offering a $25,000 reward.
To report a tip on the disappearance or current whereabouts of Ali Lowitzer, click here: