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Lethal Weapon 4 (1998) Plot Summary

lethal weapon 4 movie poster 1998
Donner, R. (Director). (1998). Lethal Weapon 4 [Film]. Warner Bros. Pictures.

Family Developments

Life had grown more complicated for LAPD Sergeant Martin Riggs and his partner Sergeant Roger Murtaugh. Riggs was preparing for fatherhood, as his partner Lorna Cole was pregnant with their first child. Though not married, the couple had begun to consider the possibility. Meanwhile, Murtaugh was also facing changes at home—his daughter Rianne was expecting a child as well. Unknown to him, the father was Detective Lee Butters, a fellow officer. The relationship remained a secret, as Murtaugh had made it clear he disapproved of his daughter dating anyone from the department.

A Smuggling Operation Revealed

The situation took a sharp turn when Riggs, Murtaugh, and their longtime associate Leo Getz investigated a ship that had run aground off the Los Angeles coast. Aboard the vessel, they discovered Chinese immigrants being smuggled into the country. Although the ship’s captain managed to escape, the operation was quickly identified as part of a larger human trafficking network.

Among the immigrants was the Hong family, who had taken drastic measures to avoid deportation. Murtaugh, moved by their plight, brought the family into his home to offer temporary shelter. Grandfather Hong was searching for his own uncle, a skilled engraver who had paid for their voyage to the United States. Over time, a bond developed between the Murtaughs, Riggs, Cole, and the Hongs, creating a sense of extended family.

Deeper into Chinatown

Leads from the investigation directed the officers to Uncle Benny Chan, a known crime boss operating out of a Chinatown restaurant. During their visit, they met Wah Sing Ku, a high-ranking negotiator within the Triads. Despite their suspicions, the officers were denied access, as there was no probable cause for a search. Riggs responded by pulling the fire alarm, triggering the sprinklers and forcing customers to evacuate.

Outside the restaurant, Riggs recognized the ship’s captain among the crowd and attempted to apprehend him. The chase failed, and the captain evaded arrest. However, Ku later located the man and executed him for jeopardizing the operation.

A Deadly Retaliation

Shortly after, Grandfather Hong successfully contacted his uncle. Unfortunately, this communication allowed the Triads to trace their location. In retaliation, Ku and his men raided Murtaugh’s home. The Hong family was kidnapped, while Murtaugh, Riggs, Cole, and the rest of the family were tied up. The house was then set on fire.

Ping, a young member of the Hong family, had managed to hide and later helped free the others. Riggs and Murtaugh pursued the kidnappers, killing several Triad members during the chase. Ku escaped, taking Mr. Hong to the warehouse where his uncle had been forced to produce counterfeit currency in exchange for his family’s passage. In a brutal show of force, Ku killed Mr. Hong in front of his uncle to ensure compliance.

An Unusual Interrogation

Desperate for answers, the officers turned to Getz to serve as a distraction. They confronted Chan at his dental office, using laughing gas to loosen his tongue. The attempt yielded no useful information. During the chaos, Riggs and Butters accidentally revealed to Murtaugh the true identity of Rianne’s child’s father. The revelation caused an emotional shock but planted the seed for eventual acceptance.

Later, the group consulted with Detective Ng, an officer experienced with Chinese criminal organizations. Ng identified Ku’s intentions—he was likely negotiating with a corrupt general for the release of the Four Fathers, high-ranking Triad members that included Ku’s brother.

A Trail of Violence

The trail led them to an abandoned warehouse where they discovered the bodies of Mr. Hong, his uncle, and Chan, all eliminated after serving their purpose. The counterfeit money was to be used in an exchange with the Chinese general. A plan was formulated to intercept the deal and expose the fraud.

At the meeting site, the officers warned the general that the money he had received was fake. Enraged, the general executed most of the Four Fathers before himself being killed in the crossfire that followed. A violent confrontation erupted between the police, the Triads, and the general’s forces. Detective Butters was injured while shielding Murtaugh during the chaos. Ku managed to flee with his brother.

Murtaugh caught up with the fleeing pair and shot Ku’s brother. The pursuit continued to a nearby pier where Riggs and Murtaugh confronted Ku. A brutal fight ensued. Murtaugh managed to impale Ku with a length of rebar but was knocked unconscious during the struggle. The pier collapsed under the weight of the fight, plunging both Ku and Riggs into the water.

While underwater, Riggs retrieved an assault rifle and killed Ku. He was nearly trapped by debris, but Murtaugh regained consciousness and pulled his partner to safety.

A New Beginning

Following the intense operation, Riggs and Getz rushed to the hospital, where Lorna had gone into labor. Before the birth, the couple was ceremonially married by a rabbi present at the hospital. Their child was born shortly after. On the same day, Rianne delivered her baby as well. Murtaugh finally accepted Butters as part of the family, choosing to support the relationship and the newborn.

In the aftermath, the Hong family was granted asylum in the United States. Despite the violence and personal risks, the mission had succeeded. The trafficking ring had been dismantled, and families—both old and new—had been brought together through resilience, trust, and a shared fight for justice.

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