David W. Wilkinson allegedly offered an undercover police officer a staggering £26,000 to murder the pair in the cold blood.
The 44-year-old was arrested on Friday after a four-week long probe and faces two counts of conspiracy to commit murder.
It is believed he was caught after contacting the undercover officer on the phone before meeting them in person.
Related articles
Wilkinson suggested he would fund the killings with cash and shares in property, according to court documents.
He was initially arrested in May and charged with four counts of child molestation after allegedly abusing a young girl for a year.
The man – from Anderson, Indiana – is being held at the Miami County Jail in Miami, Florida until his trial.
Wilkinson did not want the two women to testify against him, a spokesman for the Miami County Sheriff's Office said on Friday.
His bail was set at £50,000 – in addition to his £195,000 bail from the original child sex abuse charges.
A jury trial for the original charges is set to begin on December 14 – but a court date for the new charges has not been set.