The death of a University of Florida student is believed to be the result of a fight between friends over a girl.

Police say the student, 18-year-old Christian Aguilar, was last seen on September 20 at a Best Buy store in Gainseville with Pedro Bravo, a childhood friend. Bravo has said they got into an argument over a girl outside the store, but little else is known for sure.

After Aguilar’s disappearance, a major search began for the missing student, and even Governor Rick Scott joined the search, which also included helicopters and K-9 units.

During the investigation into the disappearance, police questioned Bravo, who admitted to beating Aguilar until he was barely breathing, swollen and bloody, but said he left him on the side of the road.

Police also found Aguilar’s backpack in Bravo’s closet and it was also discovered he had purchased duct tape and a shovel a number of days before Aguilar disappeared, though the items have no yet been recovered.

Aguilar still has not been found and police say Bravo has been inconsistent in his telling of the fight that occurred between the two of them.

Despite the lack of a body, police have charged Bravo with first-degree murder and he had been denied bail.

Thursday, the FBI announced they had joined the search for Aguilar, and Congresswoman Ileana Ros-Lehtinen said she is glad to accept the support.

“I am pleased that the FBI has confirmed to my office that the agency is indeed involved in the case of missing UF student Christian Aguilar,” the Congresswoman stated. “The Aguilar family and all who know Christian deserve closure on this tragically sad case. It is my sincere hope that this development will accomplish this.”

Though it cannot be confirmed whether Aguilar is even still alive, police, family, and friends are all still hoping for the best.

Meanwhile, Bravo has reportedly frustrated investigators who say he has stopped talking to them.