"Firefly" fans around the world mourn the loss of one of their own. Emmy-nominated actor Ron Glass passed away today at the age of 71. No further details on his passing have been released yet. Born in Evansville, IN, Glass studied drama and literature at the University of Evansville. He then got his start in show business with guest roles on all the hit shows like "All in the Family," "Hawaii Five-O," "The Streets of San Francisco" and more. The talented actor then became a household name for his memorable role as Det.

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Ron Harris in "Barney Miller," for which he was nominated for an Emmy. It is for his role as Shepherd Book in the huge cult favorite TV series "Firefly" and for his role in "Serenity" that he is also widely known.

He was recently seen in "Agents of S.H.I.E.L.D." and "CSI."

His characters were memorable

"Firefly" fans, known as Browncoats, mourn so much more than an actor. Glass was always kind and generous to his fans, and loved by his fellow actors. "Firefly" cast members and friends have taken to Twitter to share their love. Joss Whedon tweeted: "He got there with grace, humor and enormous heart. He was, among so many other things, my Shepherd. Raise, appropriately, a glass. Rest, Ron."

Alan Tudyk "Ron Glass was one of the greatest actors to work with. His laugh was beyond infectious and his generosity was ever present."

Favorite "Firefly" cast member Adam Baldwin spoke highly of Glass as he tweeted "Happy rebirth, dear Ron Glass.

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Among the kindest and gentlest souls to have walked this earth with us."

Ron Glass was loved by 'Firefly' fans

Devoted fan, Kim Folkins out of Denver, CO described him by saying "he was a genuinely kind and honorable man. He was our Shepherd Book in our lives. He went out of his way to make you feel important; to feel special. He was our glue. He was our heart."

He saved a fan convention

At an impromptu gathering after an official sci-fi convention was cancelled, fans saw just how much he cared. He and actress Clare Kramer opened up her bar, hired last minute catering, and brought together cast and fans for a memory that will never be forgotten.