A woman found dead inside a Falls Church home Wednesday was allegedly stabbed by her boyfriend, who remains at large, Fairfax County police said.

Authorities have an arrest warrant for Juan Ramon Matetu Figueroa, 35, on a murder charge in the killing of Glenda Aviles, 28.

Police think Figueroa is driving a gold 2004 Mercedes sedan with license plate number WVF-8414.

Police were called to a home in the 6900 block of Westmoreland Road about 9:30 a.m. Wednesday to check on the welfare of an occupant.

Officers knocked on the door, but no one answered and nothing seemed out of the ordinary, police said. They returned later in the day with the homeowner and found Aviles’s body inside.

Police said Aviles and Figueroa rented a room in the house, which neighbors said was owned by a family with children. The owners declined to comment.

Police said Thursday afternoon that they were still investigating the circumstances that led to the slaying.

Claudia Lopez, a friend of Aviles’s, said the woman had a difficult relationship with Figueroa and had changed her phone number at some point to avoid his calls.

Lopez broke down after a reporter confirmed the news that her friend had died.

“She was a hard worker,” Lopez said. “She was awesome. She was lovely.”

Lopez said Aviles did not have children but supported other family members with jobs cleaning a hotel and office buildings. Aviles was from Honduras and Figueroa is Salvadoran, Lopez said.

Ray Claure, a neighbor and cousin of one of the homeowners, said one of Aviles’s roommates described hearing a loud thump about 1:30 a.m. on a recent day. The roommate told Claure he saw Figueroa leave the home about 4:30 or 5:30 a.m. on the same day in the gold car and that he never returned.

Lopez said the car belonged to Aviles.

Neighbors said Aviles had lived in the red brick home on Westmoreland for at least a year. One described hearing shouting regularly inside the house.

“It’s so sad,” said another neighbor, Esther Alexander. “[Aviles] had long, beautiful brown hair.”

Anyone with information is asked to call Fairfax County police at 866-411-TIPS.