Missing Person Notice

Every morning, there is a photo of my wife in my mailbox. My wife in the photo is already dead. I don't know who sends these photos, but every time I see one, I hate the murderer who killed my wife even more. The police have never caught the killer. After I put the photo away in my drawer, I drive out like I normally do. I first arrive at the gas station. This is near the last place my wife was seen before she went missing. I ask every staff member if they remember any new clues, but they only shake their heads. Then I drive to the mountainside. An old hunter lives there. I have always suspected him. Every time he sees me, he is very impatient. Today, just after I parked my car, he shouted from far away: "I really don't know where your wife is, stop coming here!" I ignored him and turned to leave. In the evening, I reach the cabin on the mountaintop. This is the most likely crime scene according to the police. I sit in the cabin for a long time. I only drive home when it starts to get dark. After I get home, I put the photo I received today into the mailbox.