Episode 71 of "Cold Case"
s04e02 War At Home

The 2004 case involving the disappearance of a female Iraqi war vet is re-opened when her prosthetic arm is found in a river. When Dana returned from the war she was no longer the same person she had been. Dana fought in Iraq for 93 days with her close friend, Tommy, who lost a leg, and Frank, who lost his life when their vehicle came under attack. Dana returned home as a hero to the community but not to Frank's widow, who is the number one suspect in Dana's disappearance. Meanwhile, Scotty pays a visit to his brother in regards to an ongoing child molestation investigation.