Follow CBSDFW.COM: Facebook | Twitter

JOSHUA (CBS11) – The crowd at Joshua High School’s auditorium filled every seat in the theater, stood lined against the wall and spilled out into overflow rooms.

At the front of the theater there was a casket. On the stage above it, flower arrangements, a large, blue number 33 and pictures of 15-year-old Aaron Singleton.

Singleton died after hitting his head during a football game last Thursday.

The Tarrant County Medical Examiner's Office shows Aaron Singleton died the day after family members say he fell hard hitting his face mask on the ground during a junior varsity game Thursday.

Aaron Singleton

“Look around at everybody here,” said Pastor Larry Elsea of Reece Prairie Baptist Church. “It’s packed out in the back. We have overflow rooms. And I want you to notice how many people Aaron touched in 15 years.”

Singleton was remembered by the students he played baseball and football with and the students he sang with in choir.

Several students wrote down their memories and Youth Pastor Sam Dallas read some during the service:

“I’m never ever going to forget the way his face lit up when we were laughing.”

“He was the guy you always wanted to be around. His laugh had life and energy in it and it would make you laugh too.”

“He became a brother to all of us.”

“To Aaron’s mom: P.S. You raised a great young man.”

Singleton’s body was kept on life support until organ donor recipients were ready.

“Hey, Aaron Singleton,” his uncle Jeremy Singleton said in his eulogy. “Today, I’m proud to say you’ve majorly impacted more lives in beautiful ways. Your heart saved someone’s life. Your liver saved someone’s life. Your kidneys saved two people’s lives.”

His uncle said Aaron’s brain had been donated as the first to be studied for a sports injury directly related to a known, deadly on-field sports injury.

Pastor Elsea summed up one of the lessons from losing someone so suddenly and so young saying, “You don’t know what’s going to happen tomorrow. So don’t leave words unsaid. Tell them you love them. Tell each of the family you love each other. Because life is short.”

(©2016 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)