Kansas City Chiefs quarterback Patrick Mahomes (15) walks off the field with head coach Andy Reid after an NFL football game against the Arizona Cardinals, Sunday, Nov. 11, 2018, in Kansas City, Mo. 

The stepfather of Patrick Mahomes’ longtime girlfriend Brittany Matthews suffered a medical emergency at Arrowhead Stadium on Sunday afternoon in Kansas City, Missouri and later died, the Kansas City Star reported.

Matthews, a former UT Tyler soccer player who is also a Whitehouse High School graduate along with Mahomes, posted about her loss on Instagram Sunday night.

“Today is a day I will never forget,” she wrote. “Directly after this picture I sprinted to the front entrance to see my step dad passed out! He did not come back from this and he was called to heaven today! I KNOW 100 % he is so happy up there with his kids looking down on us cheering loud that his Chiefs won today! Thank you everyone for the prayers and sweet text! We will miss you Paul So So So much! I will take care of mom for you!”

Mahomes, who broke Len Dawson’s 1964 single-season touchdown pass record in the win, wasn’t available for interviews after the game because of the family emergency.

Mahomes and Matthews have dated since the two were sophomores in high school.