For over a year, the so-called "Night Stalker" terrorized the cities of Los Angeles and San Francisco, breaking into homes and killing the people dwelling within seemingly at random. A single fingerprint in a car he had stolen would finally lead to his identification and arrest.
Please note that this program was made in 1996. In 2009, Richard Ramirez's DNA was conclusively linked to a previously unknown murder of a 9-year-old child in April 1984, thus making it his earliest known murder. Ramirez himself died in prison in 2013.
This is the full-length episode.