Why did Governor (David Morrissey).
Tyreese met his end in The Walking Dead season 5, episode 9, "What Happened and What's Going On", in what was a shocking twist for fans. At this time, the group had recently picked up a new survivor named Noah (Tyler James Williams), who hailed from a separate community. When Noah left to go look for his family, Tyreese - who had formed a friendship with Noah - helped Rick and a few others try to find him. After going into Noah's home, a distracted Tyreese was bitten on the arm by a zombie. Throughout the rest of the episode, Tyreese was haunted by hallucinations of people they had lost. For a while, it was believed that Tyreese could be saved if his arm was amputated, but in the end, he died of blood loss.
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Tyreese, who had received a great deal of screen time since his introduction, evolved into a beloved character. So why did The Walking Dead kill him off? After Tyreese's death, Chad Coleman explained in an interview that his exit from the series was showrunner Scott Gimple's decision, rather than his own. According to Coleman, Gimple said Tyreese's fate was a "necessary evil". Gimple felt that an "impactful death to remind us of the value of human life" was something that show needed. Gimple decided that this character should be Tyreese, because he was someone that fans were "endeared" to [via THR], therefore he could provide an emotional blow.
It's worth wondering if The Walking Dead didn't already deliver when it came to giving the show an "impactful death" in season 5. After all, Tyreese died just one episode after Beth (Emily Kinney) was killed in the hospital, and she had been a part of the series since season 2. But The Walking Dead didn't stop with Beth and killed off another fan-favorite in the following episode. Naturally, Tyreese's death came as a major disappointment to fans, especially those who saw Tyreese as a moral anchor for those who were a bit too violent.
Tyreese had gone through a lot over the course of the show, including the death of Karen (Melissa Ponzio), the controversial incident with the two young girls, and his conflict with bring back Tyreese, and it's easy to see why. It certainly felt that there was more to do with Tyreese, and it would have been interesting to see what would have happened if he had stuck around. How would Tyreese have adapted to Alexandria, and what would he have done about the Saviors? Unfortunately, these are questions that will never have answers.