Fact1: former Special Forces soldier has been taking aggression out on suspects, Fact2: Hunsaker 's daughter committed suicide by jumping from apartment balcony, Fact3: Hunsaker was concerned about daughter 's involvement in drugs prostitution and pornography, Fact4: Murtaugh and Riggs find drug lab on premises leading to shootout, Fact5: Shadow Company attempts to kill Riggs in drive-by shooting
Output: Shortly after his 50th birthday, LAPD Homicide Sergeant Roger Murtaugh is partnered with Sergeant Martin Riggs, a transfer from narcotics. Riggs is a former Special Forces soldier who lost his wife in a car accident three years prior, has turned suicidal, and has been taking his aggression out on suspects, leading to his superiors requesting his transfer. Murtaugh and Riggs quickly find themselves feuding with each other. Murtaugh is contacted by Michael Hunsaker, a Vietnam War buddy and banker, but before they can meet, Murtaugh learns that Hunsakers daughter, Amanda, apparently committed suicide by jumping from her apartment balcony. Autopsy reports show Amanda to have been poisoned with drain cleaner, making the case a possible homicide. Hunsaker tells Murtaugh that he was concerned about his daughters involvement in drugs, prostitution, and pornography, and was trying to get Murtaugh to help her escape that life. Murtaugh and Riggs attempt to question Amandas pimp, but find a drug lab on the premises, leading to a shootout. Riggs kills the pimp and saves the life of Murtaugh, who starts to tolerate his new partner. Though the case seems closed, Riggs is aware that the only witness to Amandas apparent suicide was Dixie, another prostitute who was working away from her normal streets. They attempt to question Dixie at her home, but it explodes as they approach it. Riggs finds parts of a mercury switch from bomb debris, indicating a professional had set the bomb; children who had been nearby witnessed a man approach the house with a tattoo similar to Riggs, and Murtaugh suspects Hunsaker knows more than he has told him. The two approach Hunsaker before Amandas funeral, where he reveals that he had previously been part of Shadow Company, a heroinsmuggling operation run by former special forces operators from the Vietnam War, masterminded by retired General Peter McAllister and his righthand man, Mr. Joshua. Hunsaker had been laundering the money, but wanted to get out, and when McAllister found out hed contacted Murtaugh, the general had Amanda killed. As they talk, Joshua arrives in a helicopter and kills Hunsaker. Shadow Company attempts to kill Riggs in a driveby shooting, but he is saved by a bulletproof vest. Murtaugh and Riggs fake his death to gain the upper hand. Shadow Company later kidnaps Murtaughs daughter Rianne and demand Murtaugh turn himself over to them for her return. Murtaugh and Riggs plan an ambush at the exchange at El Mirage Lake with Riggs providing sniper support, but Riggs is caught by McAllister and all three are taken to an unknown location. Murtaugh and Riggs are tortured for information, but Riggs manages to overpower his captors, frees Murtaugh and Rianne, and they escape to find themselves at a busy nightclub used as a front for Shadow Company. Their cover blown, McAllister and Joshua attempt to escape separately. Joshua manages to get away, but McAllister ends up crashing his car on Hollywood Boulevard and is killed when hand grenades in the car detonate. Murtaugh and Riggs race to Murtaughs home, knowing Joshua will be after his family. They arrive in time to stop him, and Riggs beats him in a violent fist fight on the front lawn. As officers arrive to take Joshua away, he breaks free and grabs a gun, but both Murtaugh and Riggs pull their guns and shoot him dead. After visiting his wifes grave, Riggs spends Christmas with the Murtaughs, having become best friends with Murtaugh and bonding with the rest of the family. Riggs also gives Murtaugh a symbolic gift: an unfired hollowpoint bullet which he had been saving to commit suicide, as he does not need it anymore.