Third arrest made in connection with Texas couple’s killing.

On Wednesday, a third person, Myrta Romanos, was arrested in connection with the killings of 18-year-old pregnant Texas woman Savanah Nicole Soto and her 22-year-old boyfriend, Matthew Guerra. The couple had been reported missing before Christmas and was later found fatally shot in a San Antonio parking lot.

Myrta Romanos, 47, is facing felony charges, including evidence tampering and destroying or concealing a human corpse, according to Bexar County records. Authorities believe Romanos is the stepmother of Christopher Preciado, a man charged with the murders.

The bodies of Soto and Guerra were discovered in a car in the parking lot of a San Antonio apartment complex two weeks ago, both having gunshot wounds to the head. The deaths were initially thought to be linked to a drug deal.

Soto, who was pregnant, was a week overdue to deliver her baby and had been scheduled for induced labor when she went missing, according to her family.

Christopher Preciado, 19, was arrested earlier in the month and charged with capital murder. His father, Ramon Preciado, 53, was also arrested at that time and charged with abusing and helping to destroy or conceal a corpse. Both are awaiting indictment, and court hearings are scheduled for February. As of now, neither has entered a plea in the case.