Clinging to life, neurosurgeon Dr. Eben Alexander says he had a brush with death, went to heaven and met God. Once a skeptic, this man of science is now a believer. On Sunday, he opens up to Oprah about the near-death experience that changed his mind. Watch the first minute of this week's show.

Tune in Sunday at 11 a.m. ET/PT to watch the complete conversation on OWN.