On Tuesday, investigators searching for Killgore, who disappeared Friday under suspicious circumstances, found a body in Riverside County.The discovery of the remains off Borel and Warren roads, roughly a mile north of Lake Skinner, was made about 2:30 p.m., San Diego County Sheriff's Department Capt. Duncan Fraser said. It was not immediately clear if the body was that of 22-year-old Killgore of Fallbrook, whose whereabouts have been unknown for four days.Killgore, whose husband is deployed overseas, disappeared Friday evening, allegedly after meeting up with 45-year-old Louis Ray Perez, a Camp Pendleton-based Marine who subsequently was jailed on an unrelated weapon charge.Homicide detectives were investigating Killgore's disappearance and believed there was "a strong likelihood" she was a "victim of foul play," sheriff's Lt. Larry Nesbit said earlier.According to San Diego County sheriff's officials, 27-year-old Jessica Lynn Lopez was taken into custody at a hotel on Rosecrans Street in San Diego and was expected to be booked on suspicion of murder.Fraser declined to discuss Lopez's alleged connection to the case. He told news crews the suspect was admitted to UCSD Medical Center under guard and was expected to be booked on a murder charge upon her release from the Hillcrest hospital. Fraser also would not say why Lopez had required medical care.While it is unknown what led investigators to Lopez's motel room, 10News has learned that when authorities arrived, they found Lopez with multiple cuts. It is believed Lopez intended to kill herself and left a note that indicated what happened to Killgore and where her body was. 10News reporter Steve Fiorina spoke with a neighbor who knew both women. The neighbor, who did not want to be identified, said Lopez was trying to leave town with a friend. "They came to give me a hug and [say] goodbye when they were leaving," the neighbor said. "They were staying at a hotel before they would fly out." 10News learned investigators are looking into whether the women were possibly involved in some unusual behavior. The neighbor said it was no secret that the two women were involved in a dangerous sex industry. "They were into the sex slave things," said the neighbor. "I tried not to judge but that's what they were into." On Sunday, a Camp Pendleton Marine was arrested in the case. Investigators said they believe Louis Ray Perez was with Killgore just before she disappeared. Perez was booked on an unrelated weapon charge, though he "is being actively investigated for this disappearance," Fraser told reporters.After being questioned about Killgore, Perez was arrested on suspicion of possessing a stolen AR-15 military assault rifle. He was being held at San Diego Central Jail on $500,000 bail pending arraignment, scheduled for Wednesday afternoon.Investigators went to the area where the body was found "based on leads stemming from the arrest of Lopez," Fraser said during a late-afternoon briefing. The captain told reporters he could release very limited information about the case before heading north to the spot where the deceased person turned up."I can't comment on the condition of the body that was found," he said. "We have not confirmed that the body ... is that of Brittany Killgore. ... The medical examiner will make that confirmation."On Monday, search-and-rescue personnel combed open areas in the De Luz area, north of Fallbrook, in hopes of determining what had become of Killgore. It was unclear what led them to that spot.Nesbit said Perez had been "uncooperative and not completely forthcoming about his knowledge." The lieutenant would not comment on the nature of the missing woman's relationship with Perez.Among the suspicious circumstances in the case was the fact that Killgore's cellphone was found by trolley security guards in the Gaslamp Quarter, even though investigators do not believe she had gone there herself on the night she vanished, Nesbit said.Killgore filed for divorce last week, according to court records. Her Camp Pendleton-stationed husband, Cory, reportedly has been serving a tour of duty in Afghanistan but is in the process of being sent home due to his wife's disappearance.