Wikipedia
Theodore "T-Dog" Douglas is a fictional character from the horror drama television series The Walking Dead, which airs on AMC in the United States and is based on the comic book series of the same name''. ''He was created by series developer Frank Darabont and portrayed by IronE Singleton. The character was first introduced in the first season as a member of the group that series protagonist Rick Grimes encounters in Atlanta. T-Dog was portrayed as a well-intentioned and kindhearted man towards his fellow survivors, although he struggles to prove his worth in the group. The character eventually adapts to the group and becomes one of Rick's right-hand men.
T-Dog is an original character in the television series and has no counterpart in the graphic novels. Singleton made several recurring appearances as the character in the show's first through third seasons. The character was ultimately met with a mixed reception, with the criticisms of professional reviewers claiming that T-Dog lacked character development and dialogue (particularly in the show's second season), while praise was directed towards his increased dialogue in the third season, and the heroic nature of his death.