How is forensic anthropology differ than anthropology?

They are both studies of humans, they just differ in content.

Forensic Anthropology studies causes of death in humans, alike to the show "Bones" on TV. She is represented as a forensic anthropologist.

Just a general Anthropology degree will work with Humans in general. It can be specific down to cultural, physical, economic, forensic, etc. But by definition, it is the study of humans.