The series Grey's Anatomy (my favorite series), because many characters have died. For example, the death of the main character, Derek, was very sad. I don't have another series to mention.

The series Grey's Anatomy is my favorite series because it has more character deaths than other shows. One example is the death of the main character Dereck which was very sad, and I guess I don't have another series that I can mention.

The TV series Grey's Anatomy (this is my favorite TV series) because many of the characters died. For example, the death of the main character, Dereck, was very sad. I can't think of another series.