A dispute between neighbors turned deadly on Monday afternoon, leaving a retired Houston police officer dead in a gated community in Kerrville. Kerr County Sheriff W.R. âRustyâ Hierholzer said his office continues to investigate the shootout between neighbors Mart Hanna and Kenneth Brown. Hanna, who retired from the Houston Police Department, was shot and killed. Condolences and prayers flooded social media Tuesday and Wednesday following the news that Hanna had died near his home at The Horizon gated community west of Kerrville. According to the sheriffâs officeâs press release, âa verbal disturbanceâ between Hanna and the 71-year-old Brown, a neighbor, âled to both residents pulling guns and exchanging gunfire.â No arrests were made, but Hierholzer said his agencyâs findings would be submitted to a grand jury for review. The Texas Rangers are also aiding in the investigation.Â