She was comatose for 28 years until her death in 2008 .
Von Bulow was convicted of attempted murder on the theory that he injected his wife with insulin , sending her into a coma .
wife was comatose for 28 years until wife 's death in 2008 .
Von Bulow was convicted of attempted murder on the theory that he injected his wife with insulin , sending her into a coma .