"It is with a heavy heart that we share the news that Wilde Lake High School teacher Ms. Laura Wallen was found deceased tonight by Montgomery County Police", the Howard County Public School System said in a statement Wednesday.
"Since this investigation began, Mr. Tessier has provided information to detectives that led them to suspect his involvement in this case", Montgomery County Police Chief Thomas Manger, said following the arrest.
Manger said Tessier's believed to have driven Wallen's vehicle to Columbia, and that Tessier admitted to disposing of the car's front tag, as well as Wallen's driver's license and iPhone.
Manger said that Wallen sent a text message to either her sister or a friend on September 2, "saying that Tyler had taken her to an open field up in the Damascus area", Manger recalled.
"Laura, if you are listening, it doesn't matter what's happened, it doesn't matter what type of trouble, there is nothing we can't fix together - myself and your family", Tessier said to reporters and press at Monday's news conference.
"I know what she means to me, and I know what she means to everybody else", he said. The acquaintance declined to assist him. Earlier that day, officers and cadaver dogs located Wallen's body, buried in a field, in an area where they believed Tessier had stayed. During the news conference, Tessier wept and held hands with Wallen's parents.
The court documents go on to describe the elaborate steps Tessier allegedly took to cover up Wallen's death, including texting her sister from Wallen's phone, pretending to be her.
Just days before the gruesome discovery, Tessier appeared alongside Wallen's family at the news conference about her disappearance on Monday, where he said, "I pray that she's safe and that she comes back". Police said Wednesday that they had asked Tessier to do the press conference, calling it "a calculated decision" to see what he would reveal.
Police are not sure of Tessier's motive, but he has been charged with murder.
Wallen then sent her sister a photo of a field in Demascus.
Her sister told her to take a picture. "I think leading up to the weekend that she's missing, I don't believe that anybody has any inclination to believe that something's wrong".
The school's "Gathering of Hope" event scheduled for Wednesday night has reportedly been canceled.
The Montgomery County Police Department Wednesday afternoon searched the perimeter of a wooded area in Damascus, where investigators allege that Wallen's boyfriend had taken several trips recently to an acquaintance's property.
He called police when he heard she didn't show up to class at Wilde Lake High School in Columbia. That woman has been interviewed by police, but Manger was unable to elaborate on what was discovered.
The cause of death is unknown, Manger said.