Jason Ritter, who plays lawyer Julian Markston on Matlock, struggled to keep a massive spoiler for the season finale under wraps. The actor revealed that he was one of the first to know that he would be the mystery WellBrexa conspirator, and it was difficult to keep the secret from his co-stars.
Showrunner Jennie Snyder Urman dropped the bombshell on Ritter about two-thirds of the way through the season, leaving him excited but also secretive. Co-star Skye P. Marshall, who plays Julian’s ex Olympia Lawrence, noticed that something was up and zeroed in on Ritter to find out if he knew.
Ritter had to keep his secret even from his wife, Melanie Lynskey, star of Yellowjackets, as she dislikes spoilers. He says the cast reacted with shock and excitement when they read through the script for the finale, hearing gasps and reactions like “I can’t believe it was you!” Ritter’s standout scene in the finale features Julian confessing his guilt to Olympia, revealing a deep secret that leaves the audience eager for more.
The season 1 finale sets up many cliffhangers for season 2, including Alfie’s father coming home and Claudia’s pregnancy. The show’s creator wants viewers to know that Julian’s armor has cracked, leaving him vulnerable to those around him.
Source: https://ew.com/matlock-jason-ritter-cant-tell-wife-melanie-lynskey-spoilers-11716878