Y462

Y462 is the member of the Mafia.

Plot
Y462 makes the trade for the Death Note with Soichiro Yagami in exchange for Sayu. He kills Miller as a test to see if the Death Note is in fact real, and then Zakk Irius and Kyle Block, the plane's captain in order to eliminate all links to the kidnapping.

Rod Ross falsely promised Y462 that if he succeeds with this exchange, then Ross will forget about Y462's past failures. After Y462 placed the Death Note in a missile and took off separately on a helicopter, Jack Neylon detonated the aircraft to kill Y462 to eliminate the final link to the kidnapping.