Prosecutor: Virginia Tech Students Planned the Murder of 13-year-old Nicole Lovell

Two Virginia Tech students painstakingly plotted the kidnapping and killing of 13-year-old girl Nicole Lovell, prosecutors alleged in court on Thursday.

During a bond request for 19-year-old Natalie Keepers, prosecutor Mary Pettitt told the judge that Lovell's throat was slit.

Pettitt said Keepers and David Eisenhauer bought cleaning supplies and a shovel at separate Wal-Marts, and then hid the girl's body in the trunk of a Lexus.

Pettitt told the judge that Keepers had told FBI investigators about the murder plot.

"I was excited to be part of something secretive and special," Pettitt testified that Keepers had told FBI investigators.

Pettitt said that Keepers had told police that she and Eisenhauer had bought a shovel at a Wal-Mart. Then, after Lovell was dead, they allegedly went to another Wal-Mart to buy cleaning supplies while the girl's body was in the trunk of Eisenhauer's car.

While Keepers allegedly cooperated with the FBI, she is adamant that she was not present during the murder. But Pettitt still pushed for the 19-year-old woman to be held without bond. "She is in the same position as the person who carried out the murder," Pettitt told the judge.

Phone Messages Led To Arrest

According to Pettitt, messages on Lovell's phone led police to Eisenhauer. Prosecutors say that he initially denied any involvement in the girl's disappearance and death.

Later, Eisenhauer admitted that he drove to her house and watched her climb out the window, Pettitt said.

David Eisenhauer was arrested last week and charged with felony counts of first-degree murder and abduction.

Natalie Keepers is now charged with accessory before the fact to first-degree murder. She was originally charged with one felony count of improper disposal of a dead body and one misdemeanor count of accessory after the fact in the commission of a felony. The new charges carry a penalty of 20 years to life in prison.

"Based on the evidence collected to date, investigators have determined that Eisenhauer and Nicole were acquainted prior to her disappearance,” Blacksburg police said in a statement obtained by PEOPLE earlier this week. “Eisenhauer used this relationship to his advantage to abduct the 13-year-old and then kill her.”

Keepers and Eisenhauer are being held without bond. They have yet to enter a plea.