Reporter Hannah Knowles reveals a portrait of a fragmented and indifferent criminal justice system that for decades allowed the country’s deadliest serial killer to target those on the margins of society.Read more:America’s deadliest serial killer went undetected for decades. Between 1970 and 2005, he claims to have killed at least 93 people — nearly all women, many who remain unidentified.For months, a team of reporters at The Post has been investigating Samuel Little’s killings —of people who lived on the margins of society, whose murders police failed to connect and solve. Subscribe to The Washington Post: postreports.com/offer