I have successfully gathered the core information about David Ellis's death. The search results confirm he was a 23-year-old male from Parsons, KS, who died on June 3, 2016. While his obituary describes his death as 'unexpected,' other sources clearly state he was 'lost to gun violence' and his death is considered a homicide.
However, despite multiple targeted searches for information regarding an investigation, suspects, or arrests, no such details have emerged.
The available online sources seem to be limited to his obituary and pages memorializing him as a victim of gun violence. There are no news articles detailing the police investigation, any persons of interest, or any arrests made in connection with his death.
Therefore, I have all the available information from the online sources I can find. I can now proceed to write the synopsis based on the information I have, which will detail his life and the circumstances of his death as reported, but will also have to reflect the lack of information regarding any subsequent investigation or arrests.