"I guess you could say that," Charlton said, when asked whether his recent signing with the Chiefs could be his last chance to resurrect a career that began as first-round pick with the Cowboys in 2017.
"My foot is on the gas for this one. I'm not saying I gave my full effort everywhere I've been. All [previous] situations, things came to an end and it was kind of mutual. It wasn't really much of a surprise. ... I was feeling kind of out of position a little bit in the past. This year, I feel like I'll be comfortable and use my talents to the best of my ability."
Charlton lasted just two seasons with Dallas, where he had four sacks in 27 games. He had five sacks in his 10 games with Miami last season, but the Dolphins recently waived him.
The Chiefs have some depth at defensive end with starters Frank Clark and Alex Okafor and former second-round draft picks Tanoh Kpassagnon and Breeland Speaks in reserve. The Chiefs also selected Mike Danna in the fifth round of this year's NFL draft.
Clark and Charlton were college teammates at Michigan.
"It was a place I was looking forward to coming," Charlton said of Kansas City. "Once I cleared [waivers], Frank was on the phone and we were talking. Nothing else really mattered. Money-wise, nothing really mattered. I just wanted to play football and wanted to go to a good situation where I could play some good football and add myself to a good defense.
"It was just everything about the organization, from hearing how great of a coach Coach [Andy] Reid is, and then once I talked to Frank, he told me how great of a coach [defensive coordinator Steve Spagnuolo] is, how great a person he is and how I'd like to play for him. That's all I really needed to hear. Once I got a chance myself to talk to him and talk to [defensive line coach Brendan] Daly, I was more comfortable with coming here. I'm excited to see what I can bring here to Kansas City."