Laurel has done an amazing job telling the story of Wildlife CSI. For human forensics investigators, they start off knowing at least what species was killed. In the case of wildlife, the only evidence may be a belt of exotic leather or a bottle of mysterious potion.
Three elephant seals were shot and killed at Piedras Blancas in May 2008, http://cbs13.com/local/elephant.seals.killed.2.715518.html. They were killed by a single shot to the head, execution-style. The case remains unsolved. It is under investigation by the National Oceanic and Atmospheric Administration. After almost two years, it's a cold case, but I hope investigators will find the person who committed this crime and prosecute him some day.