 Los Angeles police sergeant Roger Murtaugh, who has just turned 50 years old, is assigned to investigate the death of Amanda Hunsaker, a prostitute who is one of the daughters of bank president Michael Hunsaker, a friend whom Roger has known since they were in the Vietnam War together, but Roger hasn t seen Michael in 12 years. Beginning with this investigation, Roger is assigned a new partner Sergeant Martin Riggs, who has been suicidal ever since his wife Victoria "Vicky" Lynn Riggs died in a car crash in 1984. Riggs and Murtaugh s investigation of Amanda s death reveals that she was murdered. Upon hearing of this, Michael tells Murtaugh that he would like for whoever is behind Amanda s murder to end up dead, like Amanda. Riggs and Murtaugh s investigation continues and it makes them the targets of Shadow Company, a group of former Vietnam War era mercenaries who now bring heroin into the Los Angeles County region. Shadow Company s leader, General Peter McAllister, and his right hand man, Mr. Joshua, want Riggs and Murtaugh dead, no matter what the cost.