In a police statement that was subsequently leaked to the press, Knox is said to have admitted being in the house at the time of the killing. She told investigators that Lumumba was infatuated with Kercher and was in the British student's bedroom before her murder. The American then denied this in later statements.
http://abcnews.go.com/International/story?id=3890938&page=1
http://abcnews.go.com/International/story?id=3890938&page=1