In 'The Walking Dead', Lucille was Negan's weapon. It was wrapped in barbed wire and he used it to brutally kill some of the characters. The 'sad' part could be associated with the horror and despair it brought. Every time it was swung, it meant the end for someone, creating a sense of dread among the survivors. It was a symbol of Negan's tyranny over the groups he encountered, and the survivors' powerlessness against it.
Lucille's story is sad because it represents the breakdown of humanity in 'The Walking Dead'. Negan used it as a tool of power and domination. It was a sign of the lawless and cruel world they lived in. Every time it made an appearance, it brought death and sorrow. The characters who faced it had no chance of survival, and their friends had to witness the horror. This cycle of violence and loss makes Lucille's story a sad one.
Glenn does die in the comic. It was a tragic and impactful moment that changed the course of the story. The circumstances of his death were intense and left a lasting impression on readers.