Benjamin “B.J.” Eastman says that after not hearing from his son Ben for three days, he began to grow concerned and started searching for the 16-year-old. Eastman says that after looking into the teen’s social media, he learned his son had last been in contact with his good friend Benny Marquez, so he went to Marquez’s house to see what he knew. According to Eastman, Marquez told him he had no information.

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“I looked him in the eye and said, ‘I will stop at nothing,’” Eastman tells Dr. Phil in an exclusive interview airing Wednesday.

Marquez and his brother are accused of raping Ben with an object and murdering him.

WATCH: Dad Whose 16-Year-Old Was Brutally Murdered Shares Last Conversation He Had With Son

In the video above, Eastman describes what he says happened when he and his father-in-law went to speak with Marquez in his home.

Marquez and his brother, Jonathon Adamson, have been charged with first-degree murder, rape, tampering with evidence and unlawful disposal of remains. Both have pleaded not guilty to the charges.

Check here to see where you can watch Wednesday’s episode.

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