Who is assigning tasks to this person? Do they not notice that they aren’t being completed? I assume you and your other co-workers aren’t covering for them by d

Who is assigning tasks to this person? Do they not notice that they aren’t being completed? I assume you and your other co-workers aren’t covering for them by doing their work as well as your own. If your work is being delayed because you need their work, let your management know. If this is stressing you, ask for a reassignment and give your reasons.