Aaron Swartz, 26, hanged himself in his Brooklyn apartment weeks before he was to go on trial on accusations that he stole millions of journal articles from an electronic archive in an attempt to make them freely available. If convicted, he faced decades in prison and a fortune in fines.

He was pronounced dead Friday evening at home in Brooklyn’s Crown Heights neighborhood, said Ellen Borakove, spokeswoman for New York’s chief medical examiner.

Swartz was “an extraordinary hacker and activist,” the Electronic Frontier Foundation, an international nonprofit digital rights group based in California wrote in a tribute on its home page.

He “did more than almost anyone to make the Internet a thriving ecosystem for open knowledge, and to keep it that way,” the tribute said.

Swartz was a prodigy who as a young teenager helped create RSS, a family of Web feed formats used to gather updates from blogs, news headlines, audio and video for users. He co-founded a company that merged with the social news website Reddit, which was later sold to Conde Nast, as well as the political action group Demand Progress, which campaigns against Internet censorship.