The Knicks have officially signed Quentin Richardson for the remainder of the season, the team announced today (Twitter link). Since the club released Solomon Jones yesterday, there is an open roster spot, meaning no corresponding move will be required to clear room for Richardson.
When the Knicks waived Jones, I speculated that perhaps James Singleton's CBA clearance issues had been resolved, since Singleton was the player the team initially wanted to sign. It doesn't appear that was the case, but Richardson, like Singleton, isn't a big man, so it seems the team is comfortable with its frontcourt depth heading into the postseason.
Richardson, who spent four seasons with the Knicks earlier in his career, is still being paid by the Magic, who released him prior to the start of the season. The 33-year-old spent two fairly unsuccessful seasons in Orlando, averaging just 4.5 PPG and an 8.4 PER in 105 contests for the Magic in 2010/11 and '11/12.
Because he hasn't signed with an NBA team since October, Richardson remains playoff-eligible, though I can't imagine him playing much of a role for the Knicks in the postseason.