Willis May, the head football coach at Marjory Stoneman Douglas High School, announced his resignation Wednesday, saying he feels miserable without his slain colleagues, ESPN reported.

The mass shooting on Feb. 14, 2018, at the Parkland, Florida, school killed 17, including assistant football coach Aaron Feis, who died shielding students from the gunman, and athletic director/wrestling coach Chris Hixon.

“I walk into my office every day, and Aaron Feis’ office is right next to me, Chris Hixon’s office is right next to me, and I miss those guys with all my heart every day,” May said, per the sports network. “It’s sad going to work every day because it hurts so bad to be without them. It’s been a year and it hasn’t gotten any better, so I need a change for me; I need it for my health.”