1. Carol’s daughter Sophia died in season two after getting lost in the woods.
After searching for her all season, it was heartbreaking to find Sofia was locked up at the farm where everyone was staying all along.
Since her days of being locked up in a barn, Madison Lintz has appeared on Amazon's murder mystery "Bosch."
She also acted in "Parental Guidance" alongside Billy Crystal and Bette Midler and took a small role in a "Nashville" episode. Lintz will appear in horror movie "Tell Me Your Name" this year.
Her younger brother, Macsen, currently plays Henry on "The Walking Dead."
2. Dale was also killed off in season two.
You might have recognized him from his earlier work in "The Green Mile" and "The Shawshank Redemption."
Jeffrey DeMunn has had small roles on several shows including "Mob City" and HBO's "Divorce."
In addition to those shows he's also taken on the part of Chuck Rhoades, Sr. on the new Showtime series "Billions." He appeared in 2017's movie "Marshall," as well.
3. Rick killed his old police partner Shane Walsh at the end of season two.
Shane died early in the comic as well, so Bernthal was more than prepared to have a short-lived run on the show.
"I fought very hard for the role of Shane, and they were clear with me that I was fighting to play a character that wasn't going to last too long on the show," Bernthal said in an interview with Starcasm. "But that was all right with me. That was a gift, because I could really craft a beginning, middle, and end for Shane."
Bernthal has had a lot of success since "The Walking Dead." He recently starred on Netflix's Marvel spin-off series "The Punisher."
Bernthal also worked alongside his former cast mate, Jeffrey DeMunn, in "Mob City," and landed roles in hit movies "Fury" and "Sicario."
Next, Bernthal has several movies out in 2018 including "Widows," "First Man," and "Stingray."
4. Noah Emmerich played the brief, but important role of Dr. Edwin Jenner at the CDC in season one.
He "opted out" after he couldn't find a cure to the zombie virus. He told Rick that everyone is infected and will turn once they die.
If he looks familiar, it's because he's Agent Stan Beeman on "The Americans."
First, Emmerich couldn't find a cure for the zombie apocalypse and now he can't even find Russian spies right under his nose next door. Poor guy.
5. Sarah Wayne Callies played Lori Grimes, who met her fateful end in season three after giving birth to Judith.
She wiped her hands clean of the show after departing. When asked if she kept up with "TWD" or the other characters' fates, she revealed that she never had to begin with.
"I never watched the show, actually. I'd watch scenes here and there, primarily of other people's work, but I don't get a whole lot of watching myself, and if anything, it's not really good for my head," Callies said in an interview with The Hollywood Reporter.
Since her days of playing Rick's not-so faithful wife, she landed a lead role on USA's "Colony" and reprised her role on the "Prison Break" limited series.
"Prison Break" returned to Fox for nine episodes April 2017. Callies also starred in the film "Into the Storm."
6. Daryl's long-lost brother Merle Dixon was shot in the chest by The Governor in season three.
Daryl heartbreakingly found his brother turned into a walker.
Since then, Michael Rooker went to the Marvel Cinematic Universe. You may recognize him as the "Guardians of the Galaxy" antihero, Yondu Udonta.
7. Laurie Holden's character, Andrea Harrison, died in the season three finale.
At the time, no one was expecting Andrea to go since she was still alive in the comics.
Holden has a recurring role in "The Americans" in its fifth and sixth seasons.
Before that she held minor roles in "Major Crimes" and "Chicago Fire" as well as a part in "Dumb and Dumber To."
Holden has also produced two films, "Honeytrap" for Netflix and "The Time of Their Lives" for Universal. In 2018, she'll star in "Dragged Across Concrete" with Mel Gibson and Vince Vaughn.
8. Milton was killed by the Governor in front of Andrea in season three.
Milton was just trying to help Andrea. When the Governor found out about his betrayal, he was fatally stabbed.
Dallas Roberts has been in a string of big movies and TV shows since his departure.
Roberts has been in "Dallas Buyers Club," "Walk the Line," CBS' "The Good Wife," and "American Crime."
He'll star as the lead in Netflix's upcoming series "Insatiable" about a civil-lawyer-turned-beauty-pageant coach.