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Doctor Saleon (also known by his snide alias Doctor Heart) was a sadistic Salarian scientist who specliazed in various amoral practices, primarily the cultivating and selling of body parts.
Doctor Saleon originally worked on the Citadel, where his activities caught the attention of then C-Sec Officer Garrus Vakarian, who had noticed an increase in the sale of body parts on the Black Market. Discovering a Turian liver, Garrus was surprised to learn soon after that it belonged to one of Saleon's former assistants, who was certain he had never lost his liver. Checking Saleon's lab, Garrus found no evidence to incriminate him.
While Garrus was interrogating Saleon's employees and attempting to find answers, one of his suspects began to bleed uncontrollably and it was discovered that he had fresh incisions all over his body. From this it was discovered that Saleon had been using his employees as living test subjects, in particular cloning their body parts for his own ends. Though he would give the test subjects a small portion of the profits for their services, if the organs failed to grow properly, Saleon would simply leave them inside the test subject, even though this would be disastrous for their health.
With this information Garrus attempted to place Saleon under arrest but the doctor had learned that C-Sec was on to him and had fled, along with a few more test subjects. Garrus attempted to have him shot down but as his ship was too close to the Citadel his order was overruled. From there, Saleon changed his name to Dr. Heart and set up a new business as though nothing had changed. From there he operated out of the MSV Fedale, unaware that Garrus Vakarian had the transponder codes for the ship.
It is possible for Garrus and Shepard to use these codes to track Saleon down, at which point the doctor unleashes his now mutated test subjects on them. Once Saleon is cornered, he feigns innocence, but Garrus and Shepard know better. Shepard can either allow Garrus to execute him (Renegade), or convince Garrus to arrest him (Paragon). Either way, Saleon refuses to surrender and draws a gun. He is promptly killed in the ensuing shoot-out.