John Welden and Remee Lee

Tampa authorities arrested a doctor's son and charged him with deceiving his pregnant girlfriend into believing the abortion pill she was taking was an antibiotic.

According to a federal arrest affidavit, John Andrew Welden tricked his girlfriend into taking an abortion pill, which resulted in the death of their unborn child.

On Tuesday, Welden, 28, was charged with first-degree murder in the death of the six-week-old fetus, and product tampering. He was denied bail on Wednesday.

Though the 6-week-old fetus is not considered medically viable, the age of the fetus is moot under federal law.

"If someone kills an unborn child while committing a federal crime, it's considered murder," Tampa lawyer Todd Foster told ABC News.

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