Caldwells' father Bryan played for ASU in the early 80s and his 19982 team had the No. 1 ranked defense in the country and knocked off Oklahoma in the Fiesta Bowl.
"They're going to let me wear my dad's old #50 jersey so that's cool," Caldwell said. "I'm just so close to the program here and feel comfortable with the players and coaches. It was a tough decision and UCLA had a lot to offer. Their coach Gary Bernardi coached my dad in high school and I was real close with him throughout the whole process.
"I'm just excited to have this decision out of the way now. it's been a fun process but I'm glad it's over and I hope to make an immediate impact at ASU when I get there next year."