Solution: A Murderous Birthday

9×9 Murdoku case · Hard · murdokuonline.org

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

C1C2C3C4C5C6C7C8C9
R11TT4EdisonT2GT
R2CBerndBTT
R3Grant3TvT
R45GVictoriaTG
R5PCCTCarolT
R6CG6TDylanP
R7HanaCG
R8TBBFloydCTTT
R9TTTvPCAnna

Where everybody stood