The mother of a Southwest flight attendant is reporting that her son died due to COVID -19 complications despite being vaccinated.

36-year-old Maurice “Reggie” Shepperson passed away on Tuesday after spending nearly a month in the hospital.

His mother says he contracted the virus in July and was placed on a ventilator in the hospital before his death.

“It hurt me so bad because it was just so quick,” Maurice’s mother Dawn Shepperson told USA Today.

“I didn’t have time to really even acknowledge what is going on. This is mind-blowing,” she added. “It’s not real. It’s not real. It’s not real.”

Southwest Airlines has since released a statement regarding Shepperson’s death:

“We are heartbroken over the loss of our Southwest employee,” Southwest spokesman Brandy King said in a statement. “Out of respect for the family, we do not have additional information to share.”

It is unclear when Shepperson received his second shot or if he had any underlying conditions, but health officials did report that severe infections are still possible after getting the COVID vaccine even though they are extremely rare.

Officials also reported that it can take up to three-weeks after the second shot for vaccines to reach their full effectiveness.