The Movie Gumshoes dust off a cold case so explosive, it’s surprising it didn’t spontaneously combust in the evidence locker. The year? 1987. The crime? Excessive gunfire, emotional baggage, and Mel Gibson’s hair. That’s right, this week, we’re investigating the buddy cop classic that redefined the genre: Lethal Weapon.

With Danny Glover counting down to retirement and Gibson doing his best impression of a human powder keg, Lethal Weapon brought heart, humor, and high-caliber action to the table. But behind the quips and car chases lies a trail of production secrets, casting near-misses, and studio gamble after gamble.

Who almost played Riggs? How did Shane Black’s script change the game? And what exactly was in Murtaugh’s coffee that kept him from quitting on day one?

The Gumshoes are following every lead, from the writers’ roo ...