Mystery deepens as Nancy Grace questions 'accidental' death of Alabama student in Barcelona

As Spanish authorities moved forward with an autopsy, Grace urged Gracey's family to hire an independent forensic expert.

"I'm not so sure that I'm going to abide by a Barcelona autopsy, no offense," Grace said.

"His wallet is floating in the water. How did that get disattached from him? And his phone is on another individual - a male with a criminal history?" Grace asked.

"And I'm supposed to believe this was an accident? No, no, I wouldn't put money on that."

"He [Gracey] went to go visit friends in Barcelona that were studying abroad. They all go out to this bar, very reminiscent of Natalee Holloway in Aruba," Grace said.

"He gets separated for whatever reason from his friends. He is observed in the nightclub… speaking to an American girl described with brown hair," she explained. "He leaves with an individual - it's caught on surveillance video. Nobody is telling me who is the individual with whom he left."

The true crime host demanded a "full and complete" autopsy, while continuing to question the details surrounding what authorities signal as Gracey's "accidental" drowning.

In a statement to Fox News, Gracey's family said they are heartbroken by the "unimaginable loss," expressing gratitude for the outpouring of support they have received.

"We are profoundly grateful for the outpouring of love, support, and prayers from people around the world - so many helped to share Jimmy's story and bring his life to light so that others may know him," his family said. "We also sincerely appreciate the continued support and coordination of the local authorities and the U.S. Consulate as we work to better understand the circumstances surrounding this tragedy."

Cavin McLay, the president of Gracey's fraternity chapter of Theta Chi, said there are "no words" to describe the pain of losing his friend.

"Jimmy always went out of his way for anyone who needed him, whether that was guidance in their faith, a shoulder to lean on, or simply to share a smile and laugh with," the statement read in part.

Gracey's school, the University of Alabama, also issued a statement.

"The University of Alabama community is heartbroken to learn of the death of Jimmy Gracey. Jimmy's loss is deeply felt across our campus. Our condolences are with the Gracey family during this devastating time," the statement read in part.