LB Rob Ninkovich, recently called up from the practice squad, was waived to make room for Walden.
Walden (6'2", 245 lbs.) was a sixth-round draft pick of the Cowboys this year. He was cut at the end of training camp and was claimed by the Chiefs on August 31. He played in nine games for the Chiefs, registering 10 special teams tackles.
Here is an excerpt from his NFL Draft Prospect page:
Compares To: RODERICK GREEN-San Francisco...Like Green, Walden is strictly a situational pass rusher with minimal value otherwise. Even though he is built like a linebacker, he has marginal field awareness and lacks the loose hips needed to get depth in his pass drops. He is simply obliterated by bigger blockers on running plays directed at him, but shows a good burst coming off the edge to wreak havoc in the pocket. His inability to grasp the playbook will limit the amount of plays he performs in.