In a large office building, there is a woman dead in her locked office, “sitting” at her desk. Except for the desk, chair, and contents on the desk, the office is empty and the air conditioner is running. On the desk there are two pieces of blank paper, a pen, and a recently sealed envelope. The office has no windows, and the door is locked from the inside. No one has directly killed her. Most likely, how was she killed?