The Rockstar Games ad of the pack
Silent Killer is a Max Payne 3 multiplayer loadout pack. It includes a Light Anti-Tank Weapon, the Slippery Character burst, and a Listening device item. So far, Silent Killer was announced to be a Max Payne 3 pre-order incentive only.
Role in multiplayer
As the name suggests, the pack appears to add stealth elements to players' multiplayer play style. However, just how exactly would a Light Anti-Tank Weapon make one a silent killer remains puzzling.