Police said in a release that 24-year-old shooting suspect Michael Arangio had barricaded himself Saturday inside a unit in The Resort at University Park complex.
Officers say they had attempted to talk Arangio into surrendering peacefully. They also tossed tear gas into the apartment, but he refused to leave.
A bomb squad robot sent into the unit after several hours discovered the man's body, and police say they believe he shot himself.
Arangio is suspected in a shooting that left three teens dead Wednesday night.
Police had received a tip from his parents that he was in the complex.