A San Antonio man impregnated his 14-year-old stepdaughter and then “threatened to kill” her entire family if she told anyone, cops allege.

Rolando Salas Fernandez, 30, had been sexually assaulting the teen for roughly half a year before his arrest this week, according to his arrest affidavit.

The victim’s mother found out about the alleged abuse on Tuesday and reported Fernandez to police, the affidavit says.

The woman found messages on Fernandez’s cell phone that were “sexual in nature” and led her to believe they were engaging “in sexual acts,” according to cops.

The teen later told authorities that she had been getting abused since December — with the last alleged incident going down on June 16. She said that Fernandez “had threatened to kill her family if the police found out.”

It’s unclear why Gomez was allowed to live with the youth, seeing how he’s currently the subject of a Child Protective Services investigation and not allowed to have contact with her. He has been charged with sexual assault of a child, with his bail being set at $75,000.

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