A soldier goes AWOL, on the run with his 17-year-old girlfriend, right after his wife's murder. Is she in danger?

Hannah Thompson, 17, was on the run, heading out of Simpsonville, South Carolina with her boyfriend, U.S. Army soldier John Blauvelt. On Oct. 26, 2016, Cati Blauvelt, his wife of just a few months, had been found stabbed to death, her body left in a concrete box in an abandoned farmhouse. The knife blade broken off and left in her neck.

"48 Hours" and correspondent Peter Van Sant reports on the case in "Cati Blauvelt: Death of A Soldier's Wife," airing Saturday, March 8, at 10/9c on CBS and streaming on Paramount+.

After investigators gave the news to John Blauvelt, he became their prime suspect. Investigator Keith Morecraft spoke with him and noted that he didn't seem surprised, "didn't ask normal questions … such as … where did you find her? How did she die?" And Investigator Cheryl Schofield was concerned for Thompson's safety, stating "If he was willing to kill his own wife, there's no telling what kind of danger Hannah Thompson would've been in by fleeing with him."