Frederick Kumi, a 31-year-old Ghanaian national, was extradited to the United States last week.
Prosecutors say Kumi is accused of participating in a romance fraud scheme.
The alleged network defrauded more than 80 elderly Americans.
The total amount stolen is said to be over $8 million.
If convicted, Kumi faces a potential prison sentence of up to 20 years.
He is also known by the name Emmanuel.
The case is being handled by prosecutors in the US.
Kumi's alleged involvement occurred before his extradition.