Yes to both pixel1. Some guys lose control of their bladder when really scared, and piss themselves. When a guy dies the muscles which keep the neck of the bladder closed, relax - and the contents of the bladder begin to leak out. Sometimes the body position keeps the bladder sealed - then when the body is moved - the contents may leak then.
People who are shot dead - will usually do this after death.
Looks like he soaked his diaper. Interesting that the sneakers were removed between photos. Either someone wanted them, or they wanted a look at his socked feet. Can't blame them.