When the Cowboys begin their second week of organized activities Tuesday running back DeMarco Murray will continue his rehab work on a hamstring injury. Murray did not practice last week because of the injury, which has been called minor, but coach Jason Garrett said the hope is Murray could return to the field sometime this week. Linebacker Justin Durant (hamstring) and defensive end Sean Lissemore (groin) are expected to do some in-practice work after sitting out last week. Safety Jakar Hamilton (hamstring) is also expected to continue his rehab.