TULSA, Oklahoma - Authorities announced Friday they are searching for a "person of interest" in the investigation of a woman found dead in her SUV.

Leticia Melendez Reyes, 26, was found Tuesday in a parked vehicle alongside a Creek County road. Reyes' two young sons were alive with her body next to them.

The Oklahoma State Bureau of Investigation said it is searching for Jose Acevedo, 48, who is the father to Reyes' children.

As reported on Thursday by News On 6, Reyes filed for a protective order against Acevedo days before she turned up dead. In filing for the protective order, Reyes wrote Acevedo, who she listed as her ex-boyfriend, threatened her life.

Investigators served a search warrant at the couple's Tulsa apartment Thursday evening, and to develop a timeline leading up to her death, interviewed people with ties to Reyes.

Acevedo hasn't been named a suspect in the death, but agents are needing to question him about his relationship with Reyes.

The medical examiner's office has not yet ruled on Reyes' cause and manner of death.

Reyes' sons -- a 2-year-old and a 4-year-old -- are now in DHS custody.

The OSBI said Reyes' parents are traveling from Mexico to be with their grandchildren, who are in DHS custody, and to begin working with child welfare services.

If anyone has information on Acevedo's whereabouts, please contact OSBI immediately at 1-800-522-8017.