Joshua Riibe, a 22-year-old from Iowa, is believed to be the last person to see Sudiksha Konanki alive on March 6.

The State Department has confirmed it is assisting in the search for missing University of Pittsburgh student Sudiksha Konanki, whom authorities believed drowned on March 6.

A man believed to be the last person to see missing University of Pittsburgh student Sudiksha Konanki is asking a court to grant him his freedom, challenging authorities’ treatment of him since the 20-year-old woman’s disappearance nearly two weeks ago.

Earlier on Tuesday, investigators from the Loudoun County Sheriff's Office, Konanki's hometown law enforcement, said they do not believe Riibe was involved.