Man was murdered in his office suspects are Gerry, Julie, Jason, Nick and Sophie. Numbers 6, 4, 9, 10, 11 are written on the calendar with blood. Guess who is the killer? riddle

Man was murdered in his office suspects are Gerry, Julie, Jason, Nick and Sophie. Numbers 6, 4, 9, 10, 11 are written on the calendar with blood. Guess who is the killer? riddle