The Buffalo Bills ended Darwin Walker's holdout by trading the disgruntled veteran defensive tackle to Chicago. In exchange, the Bills received an undisclosed pick in next year's draft. The deal marks the second time the seven-year veteran has been traded since March, when Buffalo acquired him in a deal that sent linebacker Takeo Spikes to Philadelphia. Walker, however, had refused to report to Buffalo until the team renegotiated the remaining two years on his contract. He was scheduled to make $1.3 million this year and $1.4 next season.