Peter Manuel was an American-Scottish serial killer dubbed "The Beast of Birkenshaw" after being convicted of seven murders across Lanarkshire and southern Scotland between 1956 and 1958. 

We are discussing his story as the end of Pisces season nears. Manuel's zodiac sign is Pisces! Fun fact... according to several studies the water signs (Cancer, Pisces, and Scorpio) accounted for the highest number of serial killers. 

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Sources:

Pisces Zodiac Sign: Dates, Traits, Compatibility and More | Horoscope.com

Most Common Zodiac Signs Of Serial Killers | ZodiacSign.com

4 Most Common Serial Killer Zodiac Signs, According To Study | YourTango

Killer: Peter Manuel - Beast of Birkenshaw profiled on Killer.Cloud

Peter Manuel - Wikipedia

Old Glasgow Murders: Peter Manuel Part 1: Early Life and First Crimes

10 Things You Didn’t Know About Peter Manuel, Scotland’s Most Notorious Serial Killer (wgbh.org)

Who were Peter Manuel's victims? | The US Sun (the-sun.com)

Peter Manuel | Murderpedia, the encyclopedia of murderers