Murder?

Some say that an embryo acquires a soul at the moment of fertilization. In the case of a "fetus in fetu", does the partially formed thing have a soul? If not, what happened to it? Is it murder to remove it? It would be under a law that defined a fertilized egg as a human being. Also for tubal pregnancies.

http://news.yahoo.com/s/ap/20081218/ap_on_re_us/foot_in_brain;_ylt=AvIX9DEh071innzXRbjD_ums0NUE

Tumor in Colorado newborn's brain contained foot
Thu Dec 18, 5:24 am ET
COLORADO SPRINGS, Colo. – A pediatric neurosurgeon says a tumor he removed from the brain of a Colorado Springs infant contained a tiny foot and other partially formed body parts.

Dr. Paul Grabb said he operated on Sam Esquibel at Memorial Hospital for Children after an MRI showed a microscopic tumor on the newborn's brain. Sam was 3 days old and otherwise healthy.

Grabb said that while removing the growth, he discovered it contained a nearly perfect foot and the formation of another foot, a hand and a thigh.
...
The growth may also have been a case of "fetus in fetu" — in which a fetal twin begins to form within another