he fourth season of CSI: NY originally aired on CBS between September 2007 and May 2008. It consisted of 21 episodes, only 14 of which were completed before the Writers' Strike. Seven more episodes were made after the strike, and they began airing in April 2008. Its regular time slot continued on Wednesdays at 10pm/9c.
CSI: NY The Fourth Season was released on DVD in the U.S. on September 23, 2008.Overview from themoviedb.org