Solution: Who Was It?

7×7 Murdoku case · Medium · murdokuonline.org

Carol did it — the only suspect in the room with the victim, outlined in red below.

C1C2C3C4C5C6C7
R14EdisonS3B1SCh
R2CFreyaCCT+CCh
R3PPCCAnnaCh
R45TBella2CCCC
R5CDylanSS
R6BCB6VeitP
R7BSBPCarol

Where everybody stood