The search for a U.S. college student who went missing in the Dominican Republic intensified on Monday after a man questioned by authorities visited the beach where she was last seen and spoke with officials.

The last person authorities believe may have seen Sudiksha Konanki, the 20-year-old University of Pittsburgh student who vanished while on a spring break trip in the Dominican Republic, was back on the beach — this time with investigators.

A 20-year-old University of Pittsburgh student went missing while on spring break in Punta Cana. Get updates on her case here.

Missing college student Sudiksha Konaki was last seen with her friends and a “person of interest” at a hotel bar before she disappeared in the Dominican Republic earlier this month.

Sudiksha Konanki's disappearance in the Dominican Republic has led to intense scrutiny of Joshua Riibe, the last person to see her.

Joshua Riibe, the person of interest in the disappearance of Pitt student Sudiksha Konanki, had his passport seized by authorities in the Dominican Republic.