An Oklahoma couple arrived in Florida on Tuesday to gather their son's belongings and plan his funeral after the 30-year-old was killed in a mass shooting at a gay club in Orlando.

Antonio Davon Brown, originally of Melbourne, Fla., was among at least 49 people killed Sunday morning in what was the deadliest mass shooting in modern U.S. history. At least 53 others were seriously injured.

Brown moved back to his home state about six months ago, said his stepfather, Ellis Evans. He was living in Orlando and working in human resources at a Lowes while studying for a doctorate in business.

Rossetta Evans, Brown's mother, moved to Midwest City shortly after marrying Ellis Evans in 2011. The couple received word of Antonio's death Monday.