EL DORADO HILLS, Calif. -- A case involving a missing El Dorado Hills teenager last March led police to arrest a man on Monday accused of sex trafficking, officials said.

Rishi Sanwal, 23, was arrested by FBI agents and Sacramento police at the intersection of Green Valley Road and Francisco Drive and has been charged with sex trafficking, police said.

The missing El Dorado Hills teenager, who was last seen with Sanwal in a maroon Hummer, called a friend six days after her disappearance and said she was in the Bay Area, police said.

Using the tip, investigators traced the caller ID information to several online ads placed in the erotic section of Craigslist.

Undercover officers used the same phone numbers from the Craigslist ads to make contact and arrange a meeting with a woman named "Kimberly," police said.

When the investigators arrived at a Motel 6 in Freemont, they discovered the missing El Dorado teen, and connected the online Craigslist ads to Sanwal, police said.

Sanwal is currently being held at the Sacramento County Jail.