|“||Now we've got a relationship we can build on.||„|
|~ Travis after killing Smitty|
|“||Killed in the line of duty, Riggs!||„|
|~ Jack Travis to Martin Riggs|
|“||Come on in, bitch! Door's open!||„|
|~ Jack Travis, shooting Lorna Cole with the cop killer bullets|
|“||Go to Hell, Riggs.||„|
|~ Jack Travis, after attempting to run over Riggs with a bulldozer but the latter shoots him with his own armor-piercing bullets. Riggs responds to his last words with "You first" and puts the bulldozer in gear into a burning building.|
While on street patrol, the two stumble upon the attempted hijacking of an armored car and successfully put a halt to it, although they only manage to catch one of the two would-be hijackers. For their efforts in stopping the raid, Riggs and Murtaugh are reinstated as Detectives by their superior, Captain Murphy. Murphy introduces internal affairs Sergeant Lorna Cole to the two detectives and informs them that Billy Phelps, the suspect they have in custody from the hijacking is a known associate of former LAPD Lieutenant and suspected illegal arms dealer: Jack Travis.
In the meantime, the other hijacker who escaped is brought before Travis who is conducting a business meeting with mobster Tyrone to account for his actions which have led to police heat being focused on Travis' arms business. Travis has his henchman throw the hijacker into a pit and has it filled with cement so as to display to Tyrone what happens to anyone who might double-cross him. Travis then goes to the police station, using his still valid police badge and credentials and gain access to the other hijacker in the interrogation room, and executes him. Travis is unaware that he has committed this execution on camera, and when Cole and Riggs arrive on the scene, they are able to identify him using the footage.
Back at the precinct Riggs, Murtaugh and Cole are reviewing the footage of the execution when they are interrupted by Leo Getz, who has dropped by to visit his two old buddies. When the detectives put the footage on pause to talk to Leo, Leo manages to recognize Travis and tells them where he can be found. A botched attempt to publicly arrest Travis follows, although the detectives believe that they may now have a lead to Travis' arms warehouse. En route to rendezvous with Cole at the warehouse, Murtaugh and Riggs come under fire from Tyrone's thugs. Murtaugh kills one of them, who turns out to be a friend of his son, Darryl. Murtaugh, visibly distraught, stays at the scene and Riggs continues on to meet Cole. At the warehouse, Riggs and Cole are attacked by Travis's henchmen and the two detectives gain the upper hand, secure most of the armament shipment, and the same evening they fall in love. After learning from Rianne that Murtaugh had become withdrawn over the shooting of Darryl, Riggs confronts Murtaugh on his boat and after a tense exchange of words, he helps Murtaugh get over his guilt. At Darryl's funeral, his father implores Murtaugh to find the man who sold the gun to his son. Riggs, Cole and Murtaugh arrest and interrogate Tyrone learning his weapons come from Jack Travis and bust a garage with more people working for Travis.
Travis, no longer able to procure weapons through police arms dumps due to being exposed on the footage from the execution, has Captain Murphy kidnapped in a bid to use his clearance to gain access to the arms dumps. After having Leo work on getting information about a construction site that the garage workers were connected with, Riggs, Murtaugh and Cole realize Travis' plan when Cole notices information has been hacked from the police computer, and they head to the LAPD arms dump to stop him. A major firefight breaks out at the arms dump between the detectives, their support, and Travis' men. Murphy manages to free himself, and most of Travis' men are either killed or apprehended. Travis manages to escape, and Riggs and Murtaugh vow to catch him.
With the construction site details provided by Leo, the three depart for the construction site. Once there, the detectives come under heavy fire, but eventually manage to destroy most of the illegitimate development and eliminate Travis' men. Travis wounds Cole, attacks Riggs and tries to kill him with a digger, but Riggs shoots him with his own armor-piercing bullets through the plow of the digger. Slowly dying, Travis says with his last words "Go to hell, Riggs" to which Riggs replies to him "You first," and takes his foot off the brake lever and sends Travis and the digger into the burning housing development, thus incinerating him.