A Missouri high school football player died when he went into cardiac arrest after a practice this week, according to the school district.

Kadin Roberts-Day, a 16-year-old sophomore at Joplin High School, and his teammates were doing conditioning exercises in the gym Wednesday, because it was too hot outside, where temps reached a high of 90 degrees.

Once conditioning was over, the student-athlete suffered a medical emergency around 5:30 p.m., the Joplin School District said in a statement.

Roberts-Day had a history of severe asthma, but he was cleared to play sports, Jasper County Coroner Rob Chappel said, noting that his death is under review.

Roberts-Day, an offensive lineman, weighed in at 205 pounds and was around 6-foot-3, the school’s roster shows.

His twin brother, Kaian, is also on the team.

“It is with extremely heavy hearts that we can now share the tragic loss of Kadin Roberts-Day due to a cardiac arrest,” the district said in a statement.

“Coach Jasper and his coaching staff, his teammates, fellow teachers and students at Joplin Schools remember Kadin as an extremely personable and caring student.”

Heartfelt tributes to Roberts-Day have poured in on social media.

“I can’t even find the words today for such a loss,” Fowler’s Fotos posted on Facebook Thursday.

“My heart breaks for the Roberts-Day family and especially his twin brother Kaian and their little sister Kayla. Kadin was a very well mannered, quiet, sweet, and respectable young man that I got the privilege to get to know on the sidelines over the last year.”

With Post wires