RED ENVELOPE
In the Red Envelope, the following question was found....

What were Sierra Reynold's actions like the night Frank O'Connor was murdered?

Peter answered the question correctly by running down the alibi she gave his track. The killer cleared.........................
GERALD PARKER!

BLACK ENVELOPE
The investigators sent Rob by a vote of 5-1-1-1. Peter, Diego, and Alex also received votes.  Lloyd, the lifeguard, sent Alex to the Killer's Game!  When Alex arrived back at Headquarters dragging a bodybag with Frank O'Connor's body inside, the investigators knew that Rob had been killed by the killer......

14 Suspects.....
8 Investigators....
REMAIN!!