The Will Rogers World Airport in Oklahoma City was placed on lockdown Tuesday afternoon following a shooting that left one victim dead, police said.

The victim has been identified as Michael Winchester, a 52-year-old employee of Southwest Airlines. The Kansas City Star reports he was the father of Kansas City Chiefs long snapper James Winchester.

The suspected shooter was later found dead inside a pickup truck with an apparent gunshot wound to the head, according to Capt. Paco Balderrama of the Oklahoma City Police Department. The white male suspect has not yet been identified “partly because of his injuries,” Balderrama said.

Warning: Graphic image may be disturbing to some readers.

Suspect from Airport shooting is confirmed deceased, found inside a vehicle; name not released at this time. See Facebook for live feed. — OKC Police Dept (@okcpd) November 16, 2016

KWTV via Associated Press Police respond to a shooting at Will Rogers World Airport on Nov. 15, in this still image taken from an aerial video.

Police closed the airport around 1:30 p.m. local time and asked people inside the building to shelter in place. All flights to and from the airport were suspended for hours.

We have closed Will Rogers Airport at this time. If you are inside of the airport, shelter in place until advised otherwise. — OKC Police Dept (@okcpd) November 15, 2016

In a pair of videos posted to the police department’s Facebook page, Balderrama said officers had responded to a report of shots fired in the airport parking lot. Initially, he said, police were searching for a possible second victim.

In the later video, Balderrama said police had confirmed they were not dealing with an active shooter situation and there was no second victim, but that the lone suspect was still missing at that time.

Southwest Airlines released a statement to CNN about Winchester, who was believed to be working when he was shot.

“The Southwest Airlines family is deeply saddened by the passing of our Southwest family member, and we extend our heartfelt sympathies and support to his family and Southwest co-workers at this time,” the airline said.

The Kansas City Chiefs and the University of Oklahoma Sooners, for whom Michael Winchester played in the 1980s, also sent their condolences to his family.

Our love and support is with James and the entire Winchester family. Our heartfelt thoughts & prayers are with you. — Kansas City Chiefs (@Chiefs) November 16, 2016

Tonight, our thoughts and prayers are with a great Sooner family. pic.twitter.com/9U8urqaD7z — Oklahoma Football (@OU_Football) November 16, 2016

Our hearts go out to the Winchester and @southwestair families. We’ll never understand why, but please know that we love you. #love pic.twitter.com/meemogCrBW — Will Rogers Airport (@fly_okc) November 16, 2016

CORRECTION: An earlier version of this story reported the wrong age for Michael Winchester.