New Delhi, May 2 -- A body found in Tampa Bay has been identified as the second missing University of South Florida doctoral student from Bangladesh, a sheriff said Friday. He described their killings as "a monstrous crime" and said a motive was still unknown.

Nahida Bristy's remains were found Sunday in a garbage bag discovered by a kayaker whose fishing line got snagged, said Hillsborough County Sheriff Chad Chronister. The positive identification on the badly decomposed body was eventually made using DNA and dental records, he said.

The body of her friend, fellow USF doctoral student Zamil Limon, was in another garbage bag found two days before that on a bridge over the bay. Limon's roommate, Hisham Saleh Abugharbieh, 26, was taken i...