The pregnant Maryland teacher shot dead and left in a shallow grave had tried to talk to another woman with whom her boyfriend was also engaged to marry, according to police. Investigators lured the boyfriend, Tyler Tessier, into speaking at a news conference while Wallen was still missing with the hope that his demeanor and words would help them solve the mystery. Tessier, 32, was charged with the murder of Lauren Wallen, 31.

Nancy Grace digs into this homicide story with Cold Case Research Institute director Sheryl McCollum, Los Angeles psychoanalyst Dr. Bethany Marshall, CrimeOnline reporter Leigh Egan, and cohost Alan Duke in this Crime Stories episode.

Also read: Pregnant high school teacher’s cause of death revealed; suspect denied bond

“Crime Stories with Nancy Grace” is now a national radio show, heard on SiriusXM’s Triumph Channel 132, five times a day. You can also subscribe and download the daily podcasts at iTunes and Google Play.

Feature photo: Police handout