The Orlando police department has identified the shooter as 29-year-old Matthew Joseph Scott, who has been charged with first-degree murder.
Scott was the shooter in the July 2016 Pulse nightclub shooting, which left 49 people dead.
He was also charged in a 2016 stabbing of an Orlando man, according to Orlando police.
Scott was released from prison in September 2018.
Police also identified the man who was killed as 37-year, former U.S. Marine Lance Cpl.
He served in Afghanistan in 2010 and 2012, according a U.K. Defense Ministry news release.