The Dallas Cowboys hopes of using defensive tackle Josh Brents salary to help free up salary cap room took a hit Monday when Brents trial for intoxication manslaughter was set for Sept. 23.A Dallas County grand jury in December indicted the defensive lineman in the wake of a Dec. 8 crash in the Dallas suburb of Irving that killed teammate Jerry Brown.Brent, 25, is free on $100,000 bond and is required to wear an ankle bracelet that monitors his blood alcohol level. Brent faces a maximum sentence of 20 years in prison.There is little chance Brent plays again for the Cowboys. But his $630,000 is still on the books for next season.The Cowboys put him on the reserve non-football injury list at the end of last season and can do the same in 2013. But any hopes of the salary-cap strapped Cowboys have of using his salary to clear space this year so they can sign some free agents rest with NFL Commissioner Roger Goodell. If Brent was to be suspended under the NFLs personal conduct policy, the Cowboys would get the salary cap room from his salary. But last week, NFL spokesman Greg Aiello said Goodell wouldnt rule on Brents status with the league until his case was resolved in the courts.If the Cowboys hope to get money to use in free agency, they would need Goodell to rule on Brents case earlier than September.The Cowboys currently have just $102,000 in salary cap space, rendering them unable to even offer deals to free agent prospects, including three that visited the teams Valley Ranch headquarters on Monday safeties Will Allen and Michael Huff along with linebacker Justin Durant.