At a press conference on Thursday, police officials revealed new details regarding to the death of Gavin Smith, a missing Fox exec whose body was found this week.

“There was evidence in the car that indicated he was killed in the car,” Det. Dave Dolson of the L.A. County Sheriff’s Department said.

“We are confident an arrest will be made,” he said.

Dolson added that the investigation is ongoing, but police are “optimistic we will be able to find a cause of death.” Authorities have not ruled out gunshot wounds, but don’t believe that was the case.

Dolson confirmed that hikers had found the human remains and delivered them to the coroner’s office. Several days later, the body was identified as Smith.

Smith was last seen in Oak Park, Calif., on May 1, 2012, and was 57 at the time. A development in the case appeared on Feburary 2013, when the exec’s black Mercedes Benz was found in a Simi Valley storage facility. The storage unit was connected to John Creech, who is currently serving an eight-year prison sentence on drug charges.

Creech has been named a person of interest in the case, but Dolson said there needs to be more investigation and evidence before police move in that direction