By T. Rees Shapiro,

BLACKSBURG, Va. —Law enforcement officials announced the arrest of a second Virginia Tech student in the abduction and death of a 13 year-old Blacksburg girl.

Blacksburg Police Lt. Mike Albert said that Natalie Marie Keepers, 19 of Laurel, Md., was arrested on felony charges Sunday morning for helping to dispose of the remains of Nicole Madison Lovell, whose body was found just inside the North Carolina border in Surry County.

Albert said that Keepers, who was arrested off campus, was also charged with a misdemeanor for her accessory role in the crime after Virginia Tech student David Eisenhauer allegedly abducted and killed the 13 year-old.

Albert said that police have determined that Eisenhauer knew Lovell but declined to comment on the nature of their relationship.

Eisenhauer and Keepers, who are both general engineering students at Virginia Tech, are being held without bond at the Montgomery County, Va., jail..

Eisenhauer, 18, of, of Columbia, Md., was charged Saturday morning with abduction. The first-degree murder charge was added later Saturday after Virginia State Police located the remains of Nicole Madison Lovell on Route 89, just inside Surry County, N. C., on the Virginia border, Blacksburg police said.

Police said the remains were transported to the Office of the Medical Examiner in Roanoke, Va., overnight, for an autopsy. Authorities have scheduled a news conference for 1 p.m. Sunday

Eisenhauer was arrested without incident early Saturday at his residence in Blacksburg, police said. He is being held without bond at the Montgomery County Jail.

“This has been an extremely fast investigation within the just past 12 hours,”Blacksburg Police Chief Anthony Wilson said in a news release. “And we still have a great deal to do as there are multiple interviews to conduct and evidence to collected and analyzed as we reconstruct the timeline of events leading up to Nicole’s tragic death.”

Nicole was reported missing Wednesday and was last seen in Blacksburg between midnight and 7 a.m., police said. A report issued after her disappearance said she had undergone a liver transplant and required prescription medicine daily.

The Roanoke Times reported that Nicole's family found a dresser pushed up against the girl’s bedroom door, and that her uncle, Fred Hawks Jr., said the family believes she climbed out a window.

Several agencies are assisting Blacksburg police in the investigation, including the North Carolina State Bureau of Investigation, FBI Charlotte, N.C., Field Office, and the North Carolina Medical Examiner’s Office.

Blacksburg police said that new developments in the inquiry late Friday had led to Eisenhauer and to his arrest Saturday at his residence on campus.

The developments were unspecified, and it was also unknown what led searchers to the body.

Eisenhauer, an engineering student, was an elite athlete and track star at Wilde Lake High School in Howard County, Md. In 2014, while a junior, he won the class 3A Maryland title for the 3,200-meter race, according to a Washington Post account. That was apparently only one of his attainments.

Wilde Lake school officials and coaches could not be reached.

According to a Facebook page and LinkedIn profile believed to belong to Keepers, she is freshman engineering student who wanted to work in aerospace or engineering after graduation. Her LinkedIn profile says she interned with NASA at the Goddard Space Flight Center in Greenbelt, Md., in 2014.

In a statement, Virginia Tech said the entire school community extended its support to the family and friends of the missing girl. The university said hundreds of students in the Virginia Tech Corps of Cadets as well as students and researchers conducting drone research assisted in the search for Nicole.

A Facebook page had been created to support the search for Nicole, and in the afternoon it bore the words “KEEP HOPE ALIVE.”

A comment posted on the site under the name of David Lovell said he was the girl’s father.

“[Devastated] to learn that my daughter has been found dead! I’m so in shock I know nothing more to say, I’m broken!” the posting said.

DeNeen Brown and Fenit Nirappil contributed to this report.