Justin Flippen, the openly gay mayor of Wilton Manors, Florida, suddenly died on Tuesday. He was 41.

Flippen was driving to a Wilton Manors City Commission meeting on Tuesday night while speaking with a committee member on the phone. The member became alarmed and called 911. The mayor was taken to a nearby hospital where he was pronounced dead, local media reported.

Authorities said that Flippen appears to have suffered a brain aneurysm, according to reporting from the Sun-Sentinel.

Wilton Manors is located outside Ft. Lauderdale. The city has a high percentage of people who identify as LGBT. According to the 2010 census, 14 percent of its residents are gay or lesbian couples, the second-highest percentage in the nation behind Provincetown, Massachusetts. It is one of only a handful of cities where all of the city's elected officials are LGBT.

Flippen, who was elected in 2018 and expected to win re-election this year, was engaged to be married.

Democratic presidential hopeful Pete Buttigieg, the openly gay former mayor of South Bend, Indiana, tweeted that he was “saddened” to hear of Flippen's death.

“[Flippen] was so encouraging and kind whenever we saw him,” Buttigieg wrote. “My prayers go out to his family, loved ones, and the city of Wilton Manors. Our communities owe so much to public servants like Justin.”

The Human Rights Campaign (HRC), the nation's largest LGBT rights advocate, said in a tweet that it was “[mourning] the tragic loss of Wilton Manors Mayor Justin Flippen, a longstanding and beloved member of the @HRC community.”

Wilton Manors officials said in a statement that it was a “sad and difficult time for our grieving city and community as we mourn the passing of Mayor Justin Flippen. … His death was a shock to us all.”