Atlanta ( CNN ) -- Kim Davis buried three members of her family at Savannah 's Magnolia Memorial Gardens last year . She visits them three or four times a week . She hears her brother , Troy Davis : `` I am innocent . '' She hears her sister , Martina Correia : `` Do n't give up the fight . '' And her mother , Virginia Davis : `` I love you . '' Kim Davis is left holding the family mantle now , assuming the lead to clear her brother 's name . It was a role Correia had played since August 1989 , when Troy Davis was named a suspect in the shooting death of Savannah police Officer Mark Allen MacPhail . She stayed by her brother 's side through his trial , conviction and sentencing , and visited him for two decades on Georgia 's Death Row , never slowing in her effort to exonerate him . Through the years of legal battles and appearances before judges and clemency boards , Correia suffered from breast cancer eating away her body . By the time of Davis ' execution last September , she was bound to a wheelchair . A chest tube helped her breathe . Still , she stood up from her chair to speak on her brother 's behalf . The doubt cast over Troy Davis ' guilt made him a poster child for opponents of capital punishment . Correia became one of the movement 's strongest advocates . She held on for two months after the execution , buoyed by promises to her brother that she would be his voice when he could no longer speak . `` Martina told Troy she would continue to fight , '' Kim Davis says . The execution , she says , even helped Correia make a turnaround in her failing health , so determined was she to make good on her word . They had always been close : T and T , they called themselves . Tina and Troy . But by Thanksgiving , Correia was sinking . She died a few days later . Davis took her place at a Washington anti-death penalty event . It was the first time she had spoken in her sister 's stead and she knew there would be many more such events to come . Her brother wanted it that way . Strapped to the execution gurney , Troy Davis said : `` I ask my family and friends to continue to fight this fight . '' Recently , Kim Davis drove from Savannah to Atlanta to speak about her brother at Spelman College and at Woodward Academy , a private school . She walks with a cane because of multiple sclerosis . She wears a blue T-shirt that says `` I Am Troy Davis . '' `` The fight was bigger than Troy , '' she says . `` We 're fighting against the system . '' Nothing she does will bring her brother back ; there can be no more hearings in court . But if she keeps digging , maybe one day she will find a clue . Maybe one day someone will say something that will convince everyone that her brother did not kill . She believes Georgia executed an innocent man . She can not hide her deep disappointment in the justice system . But she prays for the MacPhails , she says . `` It 's sad for someone to have so much hate in their heart . '' Troy forgave those who spoke against him , she says . So she has , too .
Troy Davis ' younger sister has taken up the battle to clear his name . He was executed for the murder of police officer Mark MacPhail . Comment: She says she prays for the MacPhail family .