Well, that really varies. Different comics handle character fates differently. Maybe you could give me a hint about the comic's title or genre to help me better answer your question.
No, comic is not dead. It still has a significant fan base and continues to evolve with new stories and art styles.
I'm not sure. You need to provide more context about who 'they' are for me to give a definite answer.
Yes, Carl died in The Walking Dead comic.
Yes, Carl is dead in The Walking Dead comic. His death was a significant plot point.
In the Walking Dead comic, unfortunately, Maggie does die. It happens during a particularly intense and dramatic storyline.
Yes, Glenn is dead in the comic. It was a major plot point that had a significant impact on the story.
Yes, Rick is dead in the comic. His death was a significant event in the story.
Carol is indeed dead. The circumstances of her death were quite dramatic and had a significant impact on the story's development.