Tony Stewart is a 44-year-old race car champion who has amassed a net worth of $70 million. Unfortunately, he announced his NASCAR retirement on Wednesday. As per his announcement, he will end his 18 lucrative years of Sprint Cup racing after the 2016 season.

One of the most successful racers with prolific net worth value, Tony Stewart has a remarkable skill and tenacity that earned him three Sprint Cup titles. But on Sept. 30, the professional stock car racing driver and NASCAR team owner decided that it's finally time for retirement. According to ESPN, Stewart said he's retirement is not because of the setback in his career caused by his broken leg in 2013 and the emotional toll of his involvement in Kevin Ward Jr.'s death.

"Deep down, you know when it's time to do something different and make a change like this," Stewart said during a news conference at the Stewart-Haas Racing shop, as per USA Today. "It's kind of a bittersweet day. ... It's not performance-based, it's just time to do what we're doing. I still fully anticipate we're going to get things turned around. If I didn't feel that way, I wouldn't waste my time next year for anybody."

Tony Stewart, whose net worth is $70 million, also warned his opponents by emphasizing he'll race like he has nothing to lose amid his NASCAR retirement announcement.

"Next year is not a coast-and-collect year," he said. "It's just the opposite because I don't have to worry about making anybody mad next year and having to deal with it in 2017. I can rough everybody up next year if that's what it takes to accomplish my goals and sit there and just smile and laugh about it at Homestead."

Even though he announced his NASCAR retirement, multimillion net worth earner Tony Stewart said that he will still be at the track to harass everybody. He also stressed that he isn't retiring from driving, just from the Sprint Cup Series.

"I'm still going to be at the track harassing everybody, so nobody is getting a free pass now," Stewart said.

Meanwhile, Tony Stewart, who has a net worth of $70 million as Celebrity Net Worth listed, is currently 25th in the Sprint Cup standings. His last win came at Dover in June of 2013, Yahoo! Sports noted.

Do you think Tony Stewart's net worth will be affected by his NASCAR retirement?