"We miss him already. Because he's the only child we have. He's my only son."

SAN FRANCISCO (KGO) -- The parents of a San Francisco International Airport worker who died on the job while towing a cargo pallet on Sunday evening, are now planning his funeral.
On Tuesday, ABC7's Luz Pena met Hospicio and Mary Jane Lacayanga, at the the funeral home where they are preparing to say goodbye to their only son, John Brandon Lacayanga, who was only 28 years old.
They are still processing the reality that they will not get to hear his voice or hug him again.
"We miss him already. Because he's the only child we have. He's my only son," said his father, Hospicio B. Lacayanga.
Getting emotional, Hospicio flashed back to the call he got on Sunday from his son's manager letting him know that John Brandon has died.
"It's very painful. What happened? I don't know why is this happening to my son?" he said.
PREVIOUS STORY: SFO employee dies while towing cargo pallet, officials say
John Brandon was working for the Dubai National Air Travel Agency at SFO -- an airport provider that offers aircraft ground handling, cargo, travel and flight catering services.
SFO said the fire department responded to a vehicle accident and found Lacayanga, "under a cargo pallet he was apparently towing"
"He never got a chance to go to emergency to see a doctor because of that. Very tragic accident that happened," Hospicio said.
The California Division of Occupational Safety and Health confirmed the agency is investigating this incident.
"Cal/OSHA has up to six months to issue citations if any violations of workplace safety regulations are identified."
The family has started a GoFundMe account to help with funeral expenses.
"He's a friendly guy. Hard working. Very sweet. Guy. He's a good guy. We miss him already," said Hospicio.
John Brandon's mom told us off camera that she spoke to her son Sunday during his lunch break. The last thing he said to her was, "I love you."
"I don't know why it happened so quick? It happened so quick," Hospicio said.
If you like to help, a GoFundMe link has been set up to help with John Lacayanga's funeral and family expenses.
Cal/OSHA's full statement:
"Cal/OSHA is investigating this incident. While the investigation is ongoing, no additional details are available. Cal/OSHA has up to six months to issue citations if any violations of workplace safety regulations are identified
For general information on Cal/OSHA enforcement, types of inspections, and how they are conducted, please refer to the Guide to Cal/OSHA."