They're joining the family of Eugene Ellison, who was shot and killed by two female officers in his apartment in 2010.
Since then, attorneys say they have found a pattern of poor investigation tactics.
"We really want the system to change here, the Ellison brothers certainly do," says attorney Mike Laux. "There is a chronic problem here and it needs to be corrected, that's the bottom line."
Little Rock Police declined to comment on the case.