Last night we saw one of the most shocking episodes of The Walking Dead ever. Sarah Waynes Callies shares her thoughts on the game-changing events of “Killer Within.” Warning: If you have not seen the episode, beware of spoilers.

We bid adieu to two major characters last night on The Walking Dead. T-Dog’s death by walker bite and self-sacrifice was sad yet heroic, and Lori’s death was an incredibly emotional scene. While Lori was never a fan-favorite on the show, her exit was sure to bring tears to even the most reluctant viewers.

Sarah Wayne Callies talked to Entertainment Weekly about Lori’s death on the show. If you’ve read the comics, you know that neither Lori nor the baby make it out of the prison alive, and Callies wanted her character to stay true to her original form.

“Frank Darabont and I argued about this several times, because he wasn’t sure he ever wanted to get rid of Lori. I fought with him about it. I said, ‘You have to. Lori’s death does something to Rick that you cannot do any other way. Eventually, you’re going to have to do it.’”

Lori’s pregnancy had to cause major complications for her health, but we were never sure if it would actually kill her.

Callies also shares that she didn’t want showrunner Glen Mazzara on set during her death scene, since it was “a scene about a mother dying,” and Mazzara had just lost his own mother. He was actually on his way to see his mom for the last time when he called Callies to break the news that Lori was being killed off on the show.

Carl’s presence at Lori’s death was incredibly emotional, and it was just as emotional for actors Callies and Chandler Riggs.

“There’s all this resonance because I watched Chandler grow from a child into a young man in the time that we’ve worked together.”

The emotion in the scene was incredibly raw, considering the two didn’t really practice it at all together.

“Chandler and I really did not rehearse the scene until we just sort of got there. And we all decided we all had so many emotions in our hearts right now, so let’s give ourselves permission to be really raw and be really honest with each other even though it’s going to hurt. That’s probably the best way to get this done.”

After her touching goodbye to Carl, Lori knows that he will be strong and can handle himself. However, she fears for Rick’s sanity after learning of his wife’s death. Callies says that Lori is “terrified of the rabbit hole that losing her is going to send Rick down.”

In the episode, we saw one last connection between Rick and Lori as they smile at each other through the prison fences. That moment made us hope that their relationship could be repaired. Unfortunately, they never got that opportunity. Callies shares how poignant that scene was for her to shoot with Andrew Lincoln.

“When we were shooting this last episode, Andy and I were looking at each other through a fence. We didn’t consider it a scene until we were shooting it and we realized it was going to be the last time that Rick and Lori Grimes are ever together. And we both just lost it. We finished the scene and we walked towards each other, met in the middle of the field and just stood there weeping for a little bit.”

We wouldn’t expect anything less than a heartbreaking end to a character’s life on The Walking Dead, and neither does Callies.

“I wanted them to have a happy ending. But of course, they didn’t. It’s The Walking Dead. There are no happy endings.”

When asked about how she felt about no longer being a part of The Walking Dead, she shares that she brought all of her emotion to the screen.

“If you want to know about how I felt about leaving the show, watch the episode.”