CNN —  

We now know the man who gunned down 12 people at a Virginia Beach office resigned the morning of the attack.

But many more questions remain as to why a veteran city engineer targeted people he’d worked with for years.

DeWayne Craddock, 40, fired indiscriminately on a municipal building Friday afternoon. He was fatally wounded in a lengthy shootout with police.

Here’s what we know so far – and what we don’t:

What led up to the attack

What we know: Before the massacre, Craddock emailed a resignation letter Friday morning, Virginia Beach City Manager Dave Hansen said.

Craddock was not forced to resign, Hansen said. His “performance was satisfactory” and he was “within good standing in his department.” Craddock had “no issues of discipline ongoing,” the city manager said.

Craddock’s supervisor asked him why he was resigning, a colleague told CNN; Craddock told his boss he was quitting for personal reasons.

But near the end of the workday Friday, Craddock shot one person in a car and then entered the building, where he fired at victims on three floors.

Alyssa Andrews took a photo of a man with a bloodied shirt outside the municipal building. The man's identity and his condition were not immediately known.
Courtesy Alyssa Andrews
Alyssa Andrews took a photo of a man with a bloodied shirt outside the municipal building. The man's identity and his condition were not immediately known.

What we don’t know: Authorities are searching for a motive. Those who knew him say they didn’t see the horror coming.

Joseph Scott said he worked with the shooter for several years and saw him that day. He said the suspect was brushing his teeth in the bathroom, as he always did, and wished him a good day.