The latest update on Orlando shooting is more surprising than shocking as reports have revealed that shooter Omar Mateen donated blood for the victims of the Pulse gay nightclub.

The OneBlood donation center revealed on Wednesday that Mateen donated blood last month during a blood donation campaign in May. One of the employees at the center recognized the shooter from a mobile blood drive following which the authorities looked into the matter. OneBlood vice president Susan Forbes released a statement to ABC News regarding the matter. “OneBlood has learned that Omar Mateen donated blood at a mobile blood drive in Ft. Pierce, Florida, on May 29,” Forbes said.

“All facets of the donation were in our normal parameters for blood donation, including screening questions and post-donation blood testing. A staff member recognized Mateen’s face from media photos and told their supervisor.”

Although the employees confirmed the shooter’s donation, they were unsure of the usage of his blood, the vice president said. He added that normally the blood donated takes almost 42 days to be used after donation. Mass shootings in America made the center evident for blood donation, where American participate in huge numbers to help victims.

Perezhilton.com reported that the Orlando shooting also affected the center as its lab supervisor, Rodolfo Ayala-Ayala, 33, was killed in the incident. OneBlood stated that the supervisor worked there since 2011 and had been made a platelet supervisor in the Orlando laboratory recently. “He was passionate about saving lives and took great pride in the lifesaving work he performed,” the center said in a statement.

“Rodolfo was often called upon to share his knowledge and best practices with many of the people in his department and was an intricate part of a team of people who work diligently to help save lives. He was a caring and friendly person and will be greatly missed by everyone who had the honor of knowing him.”