One of those texts to Laura Wallen's sister claimed the missing woman's previous boyfriend was the father of her child, an arrest warrant released Thursday alleged. The text misspelled the former boyfriend's first name, which police said added to doubts that the texts were really from Wallen.
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Tyler Tessier, 32, was arrested Wednesday evening and charged with first-degree murder in Wallen's death. The high school teacher was four months pregnant, investigators said.
Police found Wallen's remains in a shallow grave in Damascus, Maryland, about 38 miles (61 kilometers) west of Washington. Police say they are awaiting autopsy results to determine how she was killed.
Wallen's family reported her missing Sept. 5, when she didn't show up for the first day of school. Her car was found Sept. 7 at apartment complex in Howard County, not far from the high school where she taught.
Tessier gave numerous conflicting statements to detectives over the days after Wallen, 31, was reported missing, authorities said.
Wallen's parents spoke at a news conference Monday and announced a $25,000 reward for information on her whereabouts. Tessier sat with the parents, holding their hands, and cried through a brief statement. Manger said Wednesday that Tessier's participation in the news conference had been part of a police plan.
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"It was a calculated decision made by detectives to have Tessier attend the event and speak," Manger said. "It was done with the approval and knowledge of the victim's family."
Manger said detectives were curious what Tessier would say and how he would say it.
While Wallen was missing, Tessier was seen several times at the site where her body was found, police said. Detectives obtained a search warrant for the property, Manger said, and officers with cadaver dogs found the shallow grave.
Laura Wallen's father, Mark Wallen, said after a bail hearing Thursday for Tessier, that the suspect "is a monster. He's a liar."
Online court records don't list a lawyer for Tessier, who is being held without bail.