Savanah Nicole Soto and Matthew Guerra (KSAT/YouTube screenshot) and a person of interest in their murders (SAPD)

Police have revealed new details regarding Savanah Nicole Soto, the pregnant 18-year-old in Texas who was reported missing last week when she failed to show up at the hospital to be induced and was later found dead in a car alongside her 22-year-old boyfriend, Matthew Guerra.

San Antonio Police Chief Bill McManus on Thursday gave a press conference during which he confirmed that Soto and Guerra’s bodies were both found inside the couple’s gray Kia sedan and both victims died from fatal gunshot wounds. Their unborn baby was also pronounced dead at the scene.

“Clearly, it was a heinous act,” McManus said. “It was unspeakable, the tragedy of it.”

Soto was last seen alive on Friday, Dec. 22 at the apartment complex where she and Guerra both lived. She had been scheduled to go to the hospital the following evening with her mother to be induced, but never made it to the appointment. Her family then reported her missing and a CLEAR alert was issued.

Soto and Guerra’s bodies were found in the vehicle located in the 5900 block of Danny Kaye Drive on Tuesday, with police saying that the car appeared to have been at that location for several days.

The Bexar County Medical Examiner’s Office determined that the cause of death for Guerra was a gunshot wound to the head. While authorities said that the manner of Guerra’s death has not been officially determined, McManus said that both deaths are being investigated as capital murder. He later clarified that investigators currently do not believe it was a murder-suicide, but noted that the possibility still “exists.”

In response to a question from a reporter, McManus further explained that investigators currently believe Soto and Guerra were killed at a different location and then driven to the area where their bodies were later discovered.