In keeping with military policy, the name of the service member killed in the attack will not be released until 24 hours after next-of-kin are notified.
Taylor leaves behind a wife and seven children, and a town that grieves their popular mayor.
US politicians and media are reporting that the service member killed in an apparent insider attack in Afghanistan's capital, Kabul, was the 39-year-old mayor of a city in the state of Utah.
When he was ordered to deploy to Afghanistan in January, he announced that he would take a one year leave of absence as mayor.
Cox, who became friends with Taylor as they made the rounds of the "rubber chicken" circuit of Utah politics together, said Taylor's motivation for entering politics was simple.
News of Taylor's death brought shock and grief to a Utah community in which he had served as mayor since 2013 and, before that, as a City Council member.
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Utah Gov. Gary Herbert plans to hold a news conference on Sunday to discuss the death. "And right now there is a need for my experience and skills to serve in our nation's long-lasting war in Afghanistan". Taylor was identified on social media as the Guard officer killed on Saturday.
Over the past 10 months, Taylor posted periodic updates of his Afghanistan service to Facebook. During a 2007 deployment in Iraq, Taylor and his wife Jennie led an effort that collected $75,000 worth of humanitarian aid items from Utah residents that Taylor distributed to rural Iraqi villages.
'As the United States of America gets ready to vote in our own election next week, I hope everyone back home exercises their precious right to vote.
Utah's lieutenant governor, Spencer Cox, wrote on Facebook: 'We lost a genuine hero and one of the best people in our state.
'"United we stand, divided we fall".
"We are devastated by the loss of our Mayor and friend, Brent Taylor", the city said on its Facebook page.
"I am heartbroken at the news that we lost one of our own today in Afghanistan and feel completely humbled by the service and the ultimate sacrifice offered by this courageous and selfless soldier. His service will always be remembered".