Marjorie Ann Orbin is an American woman who murdered her husband Jay Orbin in Phoenix, Arizona on or about September 8, 2004, which would have been his 45th birthday. Jay Orbin was a jewelry dealer. Prior to her crime, Marjorie Orbin was a 43-year-old former Las Vegas showgirl. According to officials, she had been having affairs with several men. When Jay Orbin returned home from a business trip, investigators believe his wife shot and killed him, then dismembered his body with a power saw in an attempt to keep the affairs a secret and inherit Jay's money. The husband's body was found several weeks later, when his torso was discovered on October 23 in a plastic container on the outskirts of Phoenix. The rest of his body was never found. The wife was convicted of the murder in 2009 after a trial lasting eight months. On October 1, 2009, Marjorie Orbin was sentenced to life imprisonment.

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