The ME isn't able to determine Roger Barry's cause of death because his head and hands are not among the body parts that are found; she can only say that he is "either a Hispanic or African-American male." After Dets. Green and Briscoe have questioned multiple people in the neighborhood and find people who remember Mr. Barry (though they don't know his name), Green laments that they're still looking for "either a Hispanic or African-American male". The detectives should have asked these people whether Barry was Hispanic or African-American.