At first I thought it was a separate car from the woman’s. At the conclusion I thought it was the woman’s own car. You don’t suppose the dude is a looney tune who got in the trunk of her car and shot himself?
My supposition is that he was bird dogging up the wrong tree.
I wonder if he was a stalker and hid in her trunk in order to follow her somewhere, and was then overcome by the heat and passed out and died. Weirder things have happened.