Police: Silliman's girlfriend aware of his absence

RALEIGH - Matthew Silliman’s girlfriend knew something about his disappearance, but didn’t call police when they issued a Silver Alert, according to search warrants made public today.

An 18-year-old Apex High School student, Silliman was found dead Dec. 2 in a vacant mobile home. Four of his friends have been charged with murdering him, and three of them have confessed to being involved in his death, according to court documents.

In the documents made public today, investigators wrote that Silliman’s girlfriend, Michelle Leigh Lippert, “had knowledge of Matthew Silliman’s disappearance and did not report this knowledge to the Authorities when a Silver Alert was issued.”

The documents don’t say what investigators think Lippert knew.

According to the warrants, investigators searched Lippert’s home Feb. 19 and seized several computers and cameras. Lippert and the four teens accused in Silliman’s death were in touch with each other over the Internet and by cell phone, the documents say.

The warrants also say that Lippert told investigators there may be video of Silliman with the suspects taken hours before he was last seen by his parents.