What actually happened in the Emmett Till case?

I am seeing a narrative online that what we were taught in school in the Emmett Till case isn't actually true. That Till actually groped/assaulted the woman, not merely whistled at her, and that the woman in question never recanted her story decades later either. What actually happened, what was Emmett Till accused of, what did he say to defend himself and did the woman he allegedly harassed take back what she said? No politics or bias please I just want the truth.