UPDATE: Missing teacher’s remains found; suspect arrest

MONTGOMERY CO - The remains of Laura Wallen, a teacher at Wilde Lake High school, have been found. Montgomery County Police tweeted early Wednesday evening that they have arrested a suspect for her murder.

UPDATE: Tyler Tessier, Wallen's boyfriend was arrested as a suspect for her murder. Wallen's body was found in a shallow grave in Damascus. Police have said that it was her boyfriend who sent the "concerning" texts to her family.

Wellan was four months pregnant.

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GAITHERSBURG, MD -- The family of a Montgomery County teacher who was last heard from on Labor Day is offering a reward of $25,000 for information that leads to her being found.

"All I want is for her to come back to us and Laura if you’re out there listening, pick up the phone," said Laura Wallen's father Mark, at the news conference Monday afternoon when the award was announced.

Wallen, 31, was last heard from on September 4, when she sent a troubling text to a family member. The next day, she failed to show up for work at Wilde Lake High School in Columbia, Md. where she teaches.

"If she hadn’t called in a substitute teacher, it gave us serious concern," added Wallen.

There is also heightened concerned for Wallen as she is four-months pregnant. Her boyfriend and family said she had been excited about returning to teach and the pregnancy leading up to the disappearance.

Over the weekend, Wallen's abandoned car was found less than a mile from her school.

The lead detective investigating the case would not say what condition the car was in, but added that they are looking at it, Wallen's home in Olney, Md., and her electronics, for any clues of where she might be.

The detective said that, at this time, they do not believe Wallen's disappearance is the result of foul play.

"Her disappearance is strange, it’s uncharacteristic. But we continue to conduct the investigation as if she’s a missing person at this point," added Lt. Sean Gagen. He added that they do not know if someone is helping Wallen, but her family had a message for them, just in case.

"Whoever might be helping and hiding her, please come forward," said Mark Wallen.

"We just want to know she’s OK. We just want her back," added Tyler Tessier, Wallen's boyfriend.

Anyone with information on Wallen's whereabouts is asked to call the Montgomery County Police 24-hour police non-emergency line at 301-279-8000.