The Woman in the Iron Coffin

SINOPSE

An investigation into an African-American woman who died in the 1800s but whose body was found on a building site in 2011. What was her story, and how did she end up being found in an iron coffin?
Construction workers unearth the body of an African American woman in Queens, New York. NYPD detectives assume that she had been dead for just a few days, but this is far from the truth.