Ah-ha! So it was Lord Dayek after all! I can tell you exactly what happened!
On the night of September 2nd, Lyle Dayek, of the Dayek Manor, took Gallick and Resnick and somehow found Knife and...murdered him! *Suspensive music*
He needed to frame that on somebody...somebody with connections to Knife...somebody close to him, or maybe more than one person...after he was reminded of the Blood Pact I had with Knife and Songbird, he immediately accused Songbird and I of Knife's murder! He framed us so that he can be in the clear!