Wallen, a 31-year-old high school teacher from Olney, Maryland, was found dead in a shallow grave on Wednesday, more than a week after she was reporting missing, Montgomery County Police Chief Tom Manger said during a Wednesday news conference.
Wallen's family and friends became alarmed last week when she didn't show up for the first day of classes at the high school where she taught.
Montgomery County Police Chief Tom Manger said: "The decision to allow him to participate in that news conference was a calculated decision made by the detectives in this case for the express goal of hearing what he had to say".
A family member said they last her from her when she sent a troubling text message on Sept.4. Police have not released the contents of the text message she sent.
"Laura, if you're listening, it doesn't matter what has happened". I'm asking you to just let us know that you're safe. The police stated Tessier has already admitted to removing the front tag from Wallen's auto and disposing of her iPhone and driver's license. Surveillance video showed the two together on Saturday, Sept. 2, at a grocery store near Wallen's home.
Police also said Tessier had asked a friend for help "to clean up a mess" after his girlfriend went missing.
Wallen's sister informed detectives that she was four-months pregnant with Tessier's child, according to the Montgomery County Police Department.
Police Chief Thomas Manger will hold a news conference late Wednesday. Tessier had reportedly given inconsistent statements beforehand, and police wanted him to keep talking, so they had him address reporters at the presser. The friend advised Wallen to take picture of where she was and she did. Police believe she was killed the next day.
"Laura is in the loving arms of God now", her father, Mark Wallen, told a News4 reporter via text message on Wednesday.
Her boyfriend, Tyler Tessier, had stood with her parents Monday at a news conference and made a soulful plea for her safe return.
During the search, police said, investigators found tire tracks and freshly dug ground on a nearby property.
"Come here, give me the jelly fish hug", Wallen would tell her students at Wilde Lake High School in Howard County, according to a former student, Aiyanah Moore. The property had open fields and woods, police said.
"The decision to allow him to participate in that news conference was a calculated decision made by the detectives.to hear what he has to say", Manger said. That woman has been interviewed by police, but Manger was unable to elaborate on what was discovered.