She was seen wearing a vest and goggles, the latter of which was worn by Noah during the Nature Trail Visit.
In the Valentine's Day live stream, Sarah calls Noah, accusing him of murdering Kat, due to him matching the description of the witnesses and the aforementioned goggles being in his possession. He denies it, saying he had classes during the time she would have been murdered. He later admits in Catharsis that he thinks he killed Kat when he was taken on Thanksgiving, and that he had no control over it. Since his alibi about his classes was confirmed, it is possible that the Collective possessed Noah and made him time travel to the future during the events of the Thanksgiving footage to kill Kat.