Act two: who killed Chriag Thakur?

Hearing the title must be confused for you, and i understand that. When the devil players brought there player back to living from the void of course one more has to come back from jail and he give a threat to Shanaya but how he died? Who killed him? 

Chriag came with motive to expose them having powers and one killer kidnapping children as the part of level 3 but a new plot twist happened 

On the day of the prom where everyone expect fun and laughter no one thought Chriag body will be found dead after he was thrown down, when the police interrogate the main suspect which you guess it the players to the finger print found in the broken bottle which is presumed to be the murder weapon many suspect many reason one murder who did?