NBA player Jason Collins' Twitter account this morning hinted that he expected his week to be busy. His next communication would come via the media.

In a first-person piece for "Sports Illustrated," Collins, the former center for the Washington Wizards who is a free agent, became the first active athlete in the four major North American sports to announce he is gay. Collins, who has played for six teams in 12 NBA seasons, wrote: "The recent Boston Marathon bombing reinforced the notion that I shouldn't wait for the circumstances of my coming out to be perfect. Things can change in an instant, so why not live truthfully?"

Many people, including a number Collins' fellow NBA players, took to Twitter in support after his announcement.

Collins' team, the Wizards, supported him in a statement, and many NBA players followed suit.

Retired NBA player John Amaechi, who came out as gay after his playing career, also voiced his support for Collins, as did many other retired players.

American soccer player Robbie Rogers, who came out in February, saw Collins' announcement as the start of something bigger.

NFL players Chris Kluwe and Brendon Ayanbadejo have been outspoken gay rights supporters and they expressed their support of Collins on Monday.

Collins' announcement resonated far beyond the basketball courts, as high profile stars voiced their support.

Collins returned to Twitter to thank all those who had supported him throughout the day.

Detroit Lions cornerback Alphonso Smith posted this as part of a series of tweets expressing an opposing viewpoint. Dolphins wide receiver Mike Wallace also tweeted negative sentiments, though later deleted the tweets and tweeted an apology.

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