The gunman who allegedly killed 12 people in a Virginia Beach municipal building Friday had resigned his position with the city hours before, according to the Virginian-Pilot.

The gunman, identified as DeWayne Craddock, had been a longtime public utilities engineer with the city and had emailed his superiors that day to give them his two weeks’ notice, according to city officials.

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“We’re determining where that letter is,” City Manager Dave Hansen said at a Sunday news conference, according to the Pilot. “He notified his chain of command [Friday].”

Police Chief Jim Cervera said the gunman had not been fired and that he had been in good standing in his department.

“So many things are going on, and all the questions so far have been focused on whether or not he was fired and whether or not he was in the process of being fired. That’s a hard no,” added police spokeswoman Linda Kuehn. “And there’s a huge difference. People leave to go to other jobs all the time.”

Officials did not identify a motive for the shooting or whether law enforcement had recovered any evidence indicating any.

The victims were LaQuita Brown, Tara Gallagher, Mary Gayle, Alexander Gusev, Katherine Nixon, Richard Nettleton, Christopher Rapp, Ryan Cox, Joshua Hardy, Michelle "Missy" Langer, Robert "Bobby" Williams and Herbert “Bert” Snelling. All were city employees except for Snelling, a contractor who was at the municipal building for a license renewal at the time of the shooting.