Sharon Huddleston was sentenced Friday to life in prison for the murder of Todd Stover in May 2000.
Huddleston, 56, was convicted of first-degree murder last month by a jury that deliberated for just 38 minutes. She will be eligible for parole after serving 25 years.
Huddleston had admitted to police that she stabbed Stover in the back with a syringe, injecting him with a lethal dose of insulin because she was upset because he didn't help her find a job. Her attorney said Huddleston also told police she had not meant to kill Stover but just "mess him up."
Stover, 36, was found dead in May 2000 in a ditch by a rural road in Greenwood County. The case went unsolved for a decade.
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A break in the case came last year when Sharon Edwards called police in Carthage, Mo., where she lived.
Edwards owned the house in Park City where she had lived 10 years earlier with Huddleston and Huddleston's sister, Rhonda Pischel.
Pischel had meet Stover at a bar, and he had briefly stayed in the house, Edwards said.
Huddleston was unemployed, and Stover had said he could help her land a job at Boeing, Edwards told police. But Edwards said Huddleston became enraged when she found out Stover didn't work at Boeing.
Edwards said she was afraid of Huddleston and remained silent about the killing until March 2010. Because she was in failing health, Edwards told police she wanted someone to know the truth.
Pischel, 55, is also charged with first-degree murder. She's set for trial in May.