(Courtesy of Vienna Police Department)

Carol Lutsky, 20, of Summit Manor Court, was arrested Monday following an investigation into the death of Nehemiah Williams, whose hometown was not known, police said.

Vienna Police were called to the 1100 block of Lakewood Court on Oct. 5, 2011 for a report of an unresponsive infant, police said. Lutsky, who was an acquaintance of the child’s mother, was babysitting Williams in the rental home where she and her mother lived, police and a neigbhor said..

Before the officers’ arrival, Lutsky drove the infant to his biological mother, who was in Reston, police said.

After arriving at the location, Williams was transported to Reston Hospital and then to Children’s National Medical Center in the District the next day because his condition was deteriorating, police said.

Williams died at the center later that day.

The D.C. Medical Examiner performed an autopsy on the boy and ruled his death a homicide, police said. The cause of death was blunt force trauma to the upper body, but police declined to discuss its exact nature.

A Fairfax County fire marshal also declared the home where Lutsky lived uninhabitable the same day Williams died because “hoarding problem” made it unsafe, said Fairfax County spokesman Brian Worthy.

“If someone was in the house, they could have had difficulty getting out in a fire situation,” Worthy said.

Linda Davis, a neighbor, said the home was in disrepair on the outside and there was a foul odor coming from it.

“I told my husband, ‘If that’s what it looks like on the outside, what does the inside look like?” Davis said.

After Lutsky’s arrest, she said crews removed roughly four dumpsters worth of material from the home and teams in hazmat suits worked inside for months.

Davis said Lutsky lived there with her mother and had attended Northern Virginia Community College. She said she saw Nehemiah Williams at the home on several occassions.

Lose said the investigation involved Vienna police, the FBI forensic lab, Fairfax County police and the D.C. Medical Examiner’s office. Lose said the investigation was extremely complicated, so it took a while to complete.

“The amount of evidence they had to process was large,” Lose said.

Lutsky is being held without bond at the Fairfax County Adult Detention Center. Lose said it was the first alleged murder case in the town in at least 15 years.