Petr Zelenka (serial killer)
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Petr Zelenka (February 27, 1976) is a Czech serial killer who was arrested in December 2006. Zelenka, a nurse, murdered seven patients by lethal injection, and attempted to kill 10 others between May and December, 2006. He reportedly killed with a hidden vial of heparin - a blood-thinning drug causing internal bleeding when administered in large doses. Zelenka has already confessed and been taken into custody. His lawyer has been quoted as saying that Zalenka may have killed on an impulse to "test" doctors in Havlickuv Brod, in the belief they were not good enough to discover the truth.
