In that evening's episode, titled "13," Commander Lexa (Alycia Debnam-Carey) was shot by a stray bullet, intended for her love interest Clarke (Eliza Taylor).
Spoiler alert: This is something that has happened before.
Before the shocking episode, The 100 had received a great deal of praise for its LGBT representation.
And then, when Lexa was killed during Episode 7 of Season 3 — well, the internet exploded.
In the days that followed, fans expressed their anger, disbelief, and grief over the outcome of the episode.
The rallying cry "Lexa Deserved Better" popped up (and continues to be seen) in countries all over the world.
Upset fans also channeled their response into action, raising over $160,000 for The Trevor Project, a nonprofit organization supporting LGBTQ youth.
Now, over a year since the controversial episode aired, the Clexa fandom refuses to let the world forget about that moment in television history and their insistence that they, well, deserved better.
Ever since the character's death, any tweets mentioning The 100 will almost always be immediately followed by a reply from a member of the fandom.
BuzzFeed News spoke with one Clexa fan group that has been hard at work attempting to get a spinoff story up and running. "The Grounders" would be a project that focused on Lexa's origin story and rekindle the character's legacy on screen.
"Episode 307 slapped me right back to reality, where LGBT people are killed for their sexuality, bullied, disowned by their parents," another anonymous member of The Grounders project told BuzzFeed News. "It reminded me of the Orlando Shooting, it reminded me of death. Death that I, a queer lady, deserve."
The group recognizes that many shows, including The 100, are violent and many characters are killed off – it's pretty much a guarantee, actually. The difference, for them, is the storylines characters are given before their death.
"We need LGBT characters to have a chance, to have a happy ending, or at least survive."
For many grieving fans, the consensus seemed to be that they didn't just lose a fictional character on a television show — it was so much more than that.
Mourning for fictional characters certainly isn't a new phenomenon, but it is a process that is now amplified — and done in the company of other fans — thanks to the internet and social media.
The first event took place on March 3rd of this year, on the one-year anniversary of Lexa’s death on The 100. What started as a simple idea among friends — to bond over a character they loved and lost — quickly morphed into something much bigger.
"We are currently expecting thousands of attendees along with celebrity guests, panelists, content creators, journalists, media personalities, vendors, and artists," Winebarger said. The program will also serve as a platform for upcoming queer filmmakers to showcase their work.
"This event is for the LGBT person sitting in their small town feeling completely alone and alienated. This is for those of us that have felt like we were less than the rest of society, just because of our sexuality."