Dallas Roberts joins ‘Dallas Buyers Club’

'The Grey' star cast in Matthew McConaughey indie drama

In a fitting match between actor and movie title, “The Grey” star Dallas Roberts will join Matthew McConaughey in “The Dallas Buyers Club,” which has also added McConaughey’s “Sahara” co-star Steve Zahn to the growing ensemble.

Jean-Marc Vallee is directing from a script by Craig Borten and Melisa Wallack. Texas-based Truth Entertainment and Voltage Pictures are financing the production, currently under way in New Orleans.

Based on a true story, indie drama stars McConaughey as Ron Woodruff, an AIDS patient who teams with a female doctor (Jennifer Garner) to investigate and find alternative treatments for the disease. Given only six months to live after his initial diagnosis in 1986, Woodruff survived for six years by illegally smuggling medicine into the U.S.

Roberts will play David Wayne, Ron’s defense attorney who represents his courtroom battle to force the FDA to allow AIDS patients to receive medications such as Peptide T and Fluconazole.

Zahn will play a Dallas police officer who is sympathetic to Ron’s cause because of his own father’s bout with Alzheimer’s.

Jared Leto is set to co-star as a fellow AIDS patient who meets Woodruff in the hospital.

Robbie Brenner and Rachel Winter are producing, while Truth founders Tony Notargiacomo and Joe Newcomb will exec produce with Logan Levy, Holly Wiersma and Cassian Elwes, as well as Nicolas Chartier and Zev Foreman of Voltage.

Roberts recently co-starred in Joe Carnahan’s “The Grey” and just joined the cast of AMC’s “The Walking Dead.” In addition to a recurring role on CBS’ “The Good Wife,” Roberts credits include “Walk the Line” and “3:10 to Yuma.”

Zahn co-starred in the “Diary of a Wimpy Kid” trilogy and will next be seen in Joe Lynch’s “Knights of Badassdom.”

WME reps Roberts and Zahn, who are respectively managed by Circle of Confusion and Principal Ent. LA.