Wade Michael Page, the shooter in Sunday's massacre at a Wisconsin Sikh temple, was originally thought to have been gunned down by police -- but new evidence is emerging that indicates he, like many other spree killers before him, actually took his own life.

FBI special agent Teresa Carlson said Wednesday that the 40-year-old gunman shot himself in the head after being shot in the stomach by a police officer responding to the scene. Other than himself, Page killed six people and seriously wounded three during the rampage, including another law enforcement officer who's now said to be "up and walking."

Although Carlson said investigators have not yet "clearly defined a motive" for the killings, many believe Page, a white supremacist, mistakenly thought the Sikhs were Muslims.

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