Franz did it — the only suspect in the room with the victim, outlined in red below.
| C1 | C2 | C3 | C4 | C5 | C6 | C7 | C8 | C9 | |
|---|---|---|---|---|---|---|---|---|---|
| R1 | 1P | C | T | Ella | 2C | P | C | ||
| R2 | T | T | T | P | Clara | ||||
| R3 | Guido | C | C | C | |||||
| R4 | T | T | Björn | P | 3 | ||||
| R5 | P | T | T | Apo | |||||
| R6 | C | T | T | Heinz | |||||
| R7 | 5 | Ozzy | 4 | ||||||
| R8 | S | C | Diana | C | |||||
| R9 | S | Franz | P | S | S | S | S |