Christine Leinonen (pictured with her son Christopher Leinonen) drove to Orlando at 4am after learning of the shooting from a friend of her son, who was at Pulse and is missing.
Fifty people were shot dead after a gunman wielding an assault-type rifle and a handgun opened fire inside a crowded gay nightclub in Orlando in the early hours of Sunday after pledging allegiance to ISIS.
So far, only seven victims have been officially identified by the city of Orlando on its website.
They are: Edward Sotomayor Jr., 34; Stanley Almodovar III, 23; Luis Omar Ocasio-Capo, 20; Juan Ramon Guerrero, 22; Eric Ivan Ortiz-Rivera, 36; Peter O. Gonzalez-Cruz, 22; and Luis S. Vielma, 22.
Angel Mendez holds up a cell phone photo of his brother Jean C. Mendez, who he is looking for information about outside the hospital.
According to his LinkedIn page, Sotomayor worked as the national brand manager for ALandChuck Travel, a company that specialized in vacations for the gay community.
He was a caring, energetic man known for wearing a silly top hat on cruises, said David Sotomayor, who identified himself as the victim's cousin.
David Sotomayor, who lives in Chicago, told the AP that Edward worked for a company that held gay cruises and often traveled to promote the company's events. 'He was just always part of the fun,' he said.
The pair discovered they were related after meeting at Orlando's annual Gay Days festival around a decade ago. They texted regularly and kept in touch, last seeing each other earlier this year at a filming of the television reality show 'RuPaul's Drag Race,' David said.
David Sotomayor is a drag queen who appeared on a season of the show using the name 'Jade.'
The Americans murdered by an ISIS fanatic as they partied: Brand manager, pharmacy technician and theme park employee are among the 50 shot dead by terrorist in Florida gay club slaughter
A gunman with an assault rifle opened fire inside Pulse nightclub, killing 50 before dying in a gunfight with police
Omar Mateen, 29, of Port St. Lucie in Florida, pledged allegiance to ISIS before opening fire early on Sunday
Seven victims have been identified by the city of Orlando on its website, which is working to notify family members
They are: Edward Sotomayor, Stanley Almodovar, Luis Ocasio-Capo, Juan Guerrero, Eric Ortiz-Rivera, Peter Gonzalez-Cruz and Luis Vielma
By KHALEDA RAHMAN IN NEW YORK and LOUISE BOYLE IN ORLANDO, FLORIDA, FOR DAILYMAIL.COM
PUBLISHED: 17:29 EST, 12 June 2016 | UPDATED: 20:07 EST, 12 June 2016