Reeves, 65, who played and coached for the Cowboys, had been at the team's facility this week in anticipation of joining the organization in some capacity. But the team said Wednesday night that wasn't happening.
"We had two very good days of dialogue with Dan Reeves, and both the Cowboys and Dan had an interest in working together," Cowboys spokesman Rich Dalrymple said in a statement. "By Wednesday afternoon, we were unable to reach an agreement on all of the details of a contract, and both parties were comfortable with the fact Dan would not be joining the organization."
Last month, Reeves interviewed with the San Francisco 49ers about becoming their offensive coordinator.
Reeves was a running back for the Cowboys from 1965 to 1972, serving as a player-coach those last three seasons. After one year away, Reeves returned as an assistant coach for Tom Landry from 1974 to 1980.
Copyright 2009 by The Associated Press