A.C. Crispin, a science fiction author who wrote popular tie-in novels to Star Trek and Star Wars and helped run the online watchdog Writer Beware that alerted authors to literary scams, has died.

Crispin died of cancer Friday at age 63, according to an announcement on the Web site of the publisher Tor Books, and on the site for Writer Beware.

Crispin shared regular updates about her cancer treatment on her Facebook page. On Tuesday, she posted an emotional farewell message to her readers.

"I want to thank you all for your good wishes and prayers. I fear my condition is deteriorating," she wrote. "I am doing the best I can to be positive but I probably don't have an awful lot of time left. I want you all to know that I am receiving excellent care and am surrounded by family and friends."

Raised awareness about literary scams

Starting in 1983, she wrote more than 20 novels, many of them based on movies and TV series, including Star Trek, Star Wars and Pirates of the Caribbean.

Other novels by Crispin, whose full name was Ann Carol Crispin, included Storms of Destiny, Sylvester and an original series, Starbridge.

In 1998, Crispin and Victoria Strauss founded Writer Beware, which provides warnings about everything from poetry contests to vanity presses.

"A.C. Crispin will be missed for her vigilant devotion to sticking up for writers, her wonderful candor, her thoughtful and exciting writing, and most of all, for giving the fans of various fictional worlds sweet and unforgettable gifts," wrote Tor.com’s Ryan Britt.

With files from the Associated Press