WASHINGTON — The Virginia Tech freshman accused of killing a 13-year-old girl told a friend he met the girl at a high school party, couldn’t remember whether he had sex with her and later thought she might be pregnant, according to court documents filed this week.

David Eisenhauer, 19, has been charged with first-degree murder and abduction in the January 2016 stabbing death of the Blacksburg, Virginia, teen Nicole Lovell.

He told 20-year-old Natalie Keepers he woke up in a ditch after the party, which took place in December 2015, and kept messaging the girl who he thought was 16, Keepers told police when she was questioned after Lovell went missing in January 2016. Police later recovered Lovell’s body from a remote area about two hours from the Virginia Tech campus where Eisenhauer and Keepers were both engineering students.

Eisenhauer told Keepers he learned the girl was 13 or 14 years old and “freaked out,” Keepers said. About a week after Christmas 2015, he worried the girl might be pregnant, Keepers told police, according to the documents.

Keepers has been charged with being an accessory before the fact to first first-degree murder and concealing a body. The documents were filed by prosecutors this week seeking to block an effort by Keepers’ lawyers to keep her answers to police questioning out of her trial, which is scheduled for March.

Keepers told police Eisenhauer had continued messaging the girl but was worried about the relationship “because he was afraid to get arrested,” the court documents stated. Later, Keepers told police Eisenhauer told her he was worried about Lovell’s mental state after he said she threatened to kill herself if he stopped talking to her.

The Roanoke Times first reported on the new court documents.