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- "That's Natalie and Bob Miller. They had five kids and twelve grandkids."
- —Jessie telling Rick about the Millers[src]
Nothing is known about Bob's life before the outbreak began except that he had a wife, Natalie Miller, and had many children and grandchildren. Whether or not any of them survived the outbreak or are living in Alexandria remains to be seen.
Bob is seen at Deanna Monroe's party with Natalie. He spends his time socializing with the new arrivals and other residents. He, like the rest of the partygoers, are stunned by newcomer Sasha Williams' outburst.
Bob is sitting on his porch steps with his wife as he chats with Stacy. When he hears the commotion going on in the streets, he and his wife race to the scene, where he witnesses the fight between Pete Anderson and Rick Grimes, and then listens on as Rick gives his speech to Deanna and the rest of the townspeople before he is knocked out by Michonne.
Bob is among the townspeople present at the community forum to discuss Rick's fate after the brawl in the streets the day before. He also witnesses the murder of Deanna's husband, Reg, and the execution of Pete, both of which horrifies him and his wife.
Bob is present at the meeting with his wife in Deanna's house regarding Rick's plan on what to do with the walkers at the quarry.
Bob is one of the many townspeople by the front gate, listening to the growing horde gathering outside the walls and mourning the loss of his wife, who was killed in the attack by the Wolves. He appears to be very concerned about the situation and listens to Rick and Aaron as they address the crowd.
Bob attends Father Gabriel's prayer circle with Kent, Barbara, and several other Alexandrians. He also witnesses Enid and Glenn Rhee's green balloons floating in the sky, just before the wall is brought down by the collapsing church steeple.
Bob is among the townspeople present at the church when Rick informs them that he is no longer in charge and that all guns need to be turned over to the Saviors.
Bob is among the townspeople to witness Spencer and Negan play pool and the former's death at the hands of Negan. After Rosita attempts to shoot Negan but hits Lucille instead, Bob is horrified as Arat guns down Olivia on his command to kill a resident.
Bob appears in Rick's dream sequence as he prepares for a festival outside in the streets of Alexandria.
This list shows the victims Bob has killed:
- Possibly a few zombies
- Bob is one of the few background characters in the series to appear in four consecutive seasons, and is one such character who has not yet spoken a single line of dialogue.
- Bob is present in the Spencer/Olivia death scene in "Hearts Still Beating," but is missing, along with two other extras, as soon as Olivia is killed. Most likely they were removed from the scene between takes for unknown reasons.