Authorities in the Dominican Republic are turning up the heat on the Iowa man who was the last person to see University of Pittsburgh student Sudiksha Konanki before she went missing — grilling him into the early morning hours on Sunday.

Joshua Riibe, the person of interest in Sudiksha Konanki's March 6 disappearance in the Dominican Republic, has spoken out for the first time, stating that he is 'just trying to help.'

Even as an investigation into the case is underway, police in the Caribbean country have been interrogating one person -- Joshua Steven Riibe -- over the past several days. Here's what we know about him so far.