"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".
Wallen's sister received a text from her on Labor Day, but police believe that message was sent by Tessier.
Montgomery County Police Chief Thomas Manger will hold a news conference at 8 p.m. Wednesday to provide more details about the arrest and the investigation.
Wallen's family and friends became alarmed last week when she didn't show up for the first day of classes at Wilde Lake High School in Columbia.
Police said Tessier is the father of Wallen's baby.
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Laura Wallen, a 31-year-old who was four month pregnant, went missing September 4. The department said a suspect, who was not identified, was arrested in the slaying. "There additionally will be large teams of people available at Wilde Lake High School and Murray Hill Middle School tomorrow to support every student and staff member that need somebody to talk to".
On Monday, Wallen's family offered a $25,000 reward for information that will help find the missing woman, who is around four months pregnant. "We're just looking and praying that you're safe and I'm asking that you can just let us know that you're safe".
"There's so many people, so people that miss you", he said Monday.
Investigators determined Tessier was the last person to see Wallen alive.
The "Gathering of Hope" event scheduled for Wednesday evening has been canceled, the school system said.