The 6-foot-1, 305-pounder actually made his commitment late Thursday evening but TCU had been on his mind a lot in recent days. In fact, he told HornedFrogBlitz.com earlier on Thursday night that he was 95% certain that he would be a Horned Frog.
It wasn't long after that Broadnax decided to make the call to TCU running backs coach Curtis Luper and Head Coach Gary Patterson to give them the good news.
"Coach Patterson was really fired up and Coach Luper was too," he said. "I had told Coach Luper the same thing I told you that I was 95% sure on TCU and he said that was cool. I called him and then he called Coach Patterson and he was yelling ‘Big Joe!' He was real happy."
What led to Broadnax ultimately choosing the Horned Frogs?
"Me and my dad had a conversation about it, I just made my mind up because TCU was the only one showing me a lot of love," he said. "I visited OSU and to be honest if they would've offered me, I may have waited a little longer but since they didn't offer I talked to my dad to see what he thought. He wanted me to commit (to TCU) right then and there when I went to their junior day. We talked and he said he wanted me at TCU and that's where I wanted to be."
Speaking of his dad, Broadnax says his father couldn't be happier that he chose to stay close to home to play his college football.
"You know, my dad is a really open guy so it was pretty much up to me but he really fell in love with TCU when we went up there," he said. "He likes the coaching staff, he likes everything about TCU. He just wants me to stay healthy through my senior season and get through my senior year of high school; he's ready to see me play college football."
With just a hand full of defensive tackles expected to be on TCU's roster next season, Broadnax has a chance to compete early if he puts forth a strong effort. That's exactly what he intends to do.
"I have to just come in and work hard and put in the work on the field and off the field in school also," Broadnax said.
TCU's 2015 recruiting class is now ranked at No. 14 in the Scout.com 2015 Team Rankings.