According to the league's transaction notice, the team released the safety on Tuesday just hours after he was officially reinstated.
Jackson hasn't appeared in a game since 2011 following a second suspension for violating the NFL's policy on substance abuse. He failed to take a regular-season snap for Washington, who signed him in 2012 with hopes that the former Tampa Bay Buccaneer would provide a boost in the secondary.
General manager Bruce Allen said of Jackson on Tuesday that "after we meet with him, we might give him a chance," per The Washington Post.
No dice, and it's possible Jackson won't find a new team after 56 career starts over seven seasons.
The Redskins, meanwhile, still need a talent infusion at the position beyond Brandon Meriweather and Ryan Clark. One of this year's top safety prospects would help, but Washington lacks a first-round pick for the second year in a row because of the expensive draft-day trade that helped them net Robert Griffin III two Aprils ago.