1:15pm: While talks aren't dead, concerns over Marshall's health could ultimately kill the deal, tweets Renck. The Rockies were "aggressively" pursuing the lefty as recently as last night, he adds.

TUESDAY, 12:39pm: The Rockies and Reds discussed Sean Marshall at length last night, and a trade appeared close at one point, according to Renck. However, those talks have idled for the time being. It's not clear whether the Reds would have included any salary relief to help offset the remaining $12MM on Marshall's deal, Renck adds.

MONDAY: As they search for relief help, the Rockies appear to have shifted their focus from the free agent market to trade talks, reports Troy Renck of the Denver Post. According to Renck, Colorado is "pushing hard" to acquire a hard-throwing relief pitcher to add to the back end of its bullpen.

Renck noted earlier today that Joaquin Benoit and Grant Balfour were among the free agent power arms that interested the Rockies, but the price tags on those players and other top relievers will likely be too high for Colorado.

The Rockies' current plan is for LaTroy Hawkins to close games, so the club is looking for another arm to complement Rex Brothers in a setup role. Renck mentions Royals pitchers Wade Davis, Tim Collins, Aaron Crow and Luke Hochevar as possible fits, though Kansas City is far from the only team willing to move relievers.