Clark, a Scout 300 prospect ranked No. 2 in the state, picked the Tigers over Oklahoma, Arizona State, and Ole Miss, among several other. Clark finished with 32 offers, but the only one that mattered in the end was the one that came from Les Miles.
"It's amazing right now," Clark said. "I have to get ready to play SEC football and play in the best conference in the nation. I got to get focused and ready for the task at hand."
Clark committed to the Tigers in June and nothing appeared to sway him in the summer and early fall. However, the hometown Sooners made a huge run at Clark in the last couple of months.
OU made such a push that at one point it seemed a lot more likely for Clark to end up in Norman than Baton Rouge. But Miles and main Clark recruiter Brick Haley never even came close to throwing in the towel.
"The last in-home visits with Coach Miles and Coach Haley meant a lot," Clark said. "It was down to the wire. I know a lot of people back home are going to be mad, but I hope everybody is able to come around to it."
January was a busy month for Clark, who made visits to OU, LSU and Arizona State. Initially it appeared as though his mother, Dorshell, wanted Deondre to stay closer to home and play for OU.
That might have been the case at one time, but when Deondre was signing Monday, there was nobody happier than his mother. And his mother's approval meant the world to the future Tiger.
"She gave me her approval a couple of weeks ago," Deondre Clark said. "It was very important. Without her support, I don't know. I don't care too much about what everybody else thinks except for my family. When she said yes, it made me 10 times as more comfortable."
Despite growing up less than 20 miles from OU's campus, Clark always gave off the vibe of being an LSU fan. He said he has been all about LSU ever since Tyrann Mathieu was at the school and nothing ever changed his mind about Baton Rouge being the place for him.
"It was love at first sight," Clark said. "Coach Haley is one of the best coaches in the nation, and I can't wait to get a chance to play for him."
Clark was originally going to sign last Wednesday on signing day, but Oklahoma City Public Schools were closed Wednesday-Friday, not allowing him to do so in front of his family and friends.
Multiple reports surfaced about Clark signing with LSU but nothing being made official. Following Monday, it is 100 percent a done deal.