A couple of people replying so far would be correct. Yellow police tape isn't used for a theft, robbery, or minor assault. It's used for serious crime, such as shooting, stabbing, whether a death occurred or not.
Or it could have been a death by natural cause. Any death can lead to a murder investigation, at least initially. Anyone can simply drop dead whilst getting a BJ, HE, or FS.
Try explaining that one to your wife.