The grizzled detective and his rookie partner who somehow form a dynamic crime-fighting duo has become a Hollywood cliché. But sometimes it's true.
Gil Carrillo was the youngest cop in the LA murder department when he had a hunch that a set of seemingly random killings and abductions were all the work of one man.
His colleagues thought he was crazy, and it was only when he teamed up with Frank Salerno, a legendary detective who'd already caught two serial killers, that they were able to finally collar Richard Ramirez, known as the Night Stalker.
It was 1985 and there was a record-breaking heatwave, but everyone kept their windows and doors closed.