Solution: Behind the Screen

8×8 Murdoku case · Hard · murdokuonline.org

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

C1C2C3C4C5C6C7C8
R14CarolB6LC3TSkT
R2IBPCDylanBI
R3BCElsaB
R4BIBVanessaCFF
R5WBLC5STFloyd
R62ChChBellaCChP
R7CCCC1CGretaC
R8AlexChChPCT

Where everybody stood