Wade Michael Page shot himself to death Sunday and was not killed by a policeman after his murderous rampage at a Wisconson Sikh temple, authorities said Wednesday.
When police arrived at the scene Page shot an officer at least eight times before being wounded himself by another officer, and then dying from a self-inflicted gunshot wound, the Associated Press reported.
Police told the AP that detectives interviewed more than 100 people and scoured Page's emails even though he will never be tried for his crimes.
"We're trying to piece together, and eventually we will piece together as much as we can," said Steven Conley, an FBI agent who is in charge of national security at the Milwaukee office. "We will have a good idea of the motive by the time this investigation is done. But again, why that building, that temple, at that time, that may have died with Page."
Teresa Carlson, the FBI agent in charge of the case in Milwalkee, said agents did not find any note left behind by Page, nor did they find any evidence that he had worked with someone else to plan the shootings.
"We just want to get to the bottom of what motivated him to do it," said a leader of the New York-based Sikh Coalition, Amardeep Singh. "It's important to acknowledge why they lost their lives."
Page was a 40-year-old Army veteran who opened fire before a Sunday service at the Sikh Temple of Wisconsin with a 9 mm pistol, according to reports. The president of the temple, Satwant Singh Kaleka, was shot and killed as he tried to fend Page off with a butter knife.
"It's like any crime," said Rhode Island attorney Jack Ryan. "You focus on their recent tracks. You focus on friends, acquaintances. He had to get ready for this plot somewhere."
"Whatever the answer is, we can be reasonably sure it won't be an answer many people would say makes sense to them," said University of Wisconsin-Madison law professor Michael Scott.
"We'd like to have some peek into that twisted mind. But in the end, it's still a peek into a twisted mind that doesn't tell us anything we didn't already know about human nature."