UFC featherweight champion Conor McGregor has been pulled from his headline bout against Nate Diaz at UFC 200 on July 9. UFC president Dana White announced the news on ESPN on Tuesday, citing the Irishmans unwillingness to come to Las Vegas later this week to promote the landmark event for the company.We pulled Conor McGregor from UFC 200 and were working on other fights right now, White said. Conor did not want to come to Las Vegas and film the commercial and be a part of the marketing. Hes in Iceland training. Conor McGregor and Nate Diaz were scheduled to headline UFC 200 The news came hours after the 27-year-old stunned the world of mixed martial arts by tweeting: I have decided to retire young. Thanks for the cheese. Catch yas later.White admitted he is uncertain of McGregors future plans but maintained the UFC still has a good relationship with the sports biggest star.Is Conor retiring? Only he can answer that question. I dont know. Why did McGregor retire? We chart Conor McGregors story over the years to hunt for clues that explain his UFC 200 exit McGregors apparent decision to retire would be truly stunning for the world of MMA.At just 27, he is entering his prime and was already on track to become the transcendent star who could elevate the sport to new heights.His last fight - a second-round submission loss to Diaz - was a huge commercial success and the rematch was expected to generate massive pay-per-view figures.Also at UFC 200, former featherweight champion Jose Aldo is scheduled to face perennial contender Frankie Edgar for an interim featherweight title, with the winner moving on to fight McGregor later in the year. Conor McGregor was crowned UFC featherweight champion in December 2015 A win by New Jersey native Edgar would likely have set McGregor up to headline another landmark card for the UFC, with the pair obvious candidates to top the bill at the first-ever MMA event in New Yorks Madison Square Garden on November 12. That now appears unlikely.Whether McGregor has truly retired remains to be seen. He is currently in Iceland helping his Straight Blast Gym team-mate Gunnar Nelson prepare for his upcoming fight against Albert Tumanov at UFC Rotterdam on May 8.No official confirmation of his retirement has been forthcoming since his tweet on Tuesday but his long-time coach John Kavanagh did take to Twitter and appeared to confirm the news.Kavanagh cryptically tweeted: Well was fun while it lasted. Joao Carvalho tragically died last week McGregors apparent retirement comes just over a week after the tragic death of Joao Carvalho following a fight in Ireland at which the UFC champion was sitting cageside.Portuguese fighter Carvalho died two days after suffering a third-round technical knockout loss to McGregors SBG team-mate Charlie Ward. What next for McGregor? Reflections on Conors McGregors defeat to Diaz what the future holds On Facebook, McGregor described the incident as truly heartbreaking and a truly bitter pill to swallow.He said: Nobody involved in combat sports of any kind wants to see this. It is such a rare occurrence that I dont know how to take this.I was ringside supporting my team-mate, and the fight was so back and forth, that I just cant understand it.With the recent incident in boxing and now this in MMA, it is a sad time to be a fighter and a fight fan. Sky Bets UFC Specials Will McGregor fight again? Hes 7/2 to do so this year with Sky Bet! Click here to bet. Custom Philadelphia Phillies Nike Jerseys . 10 Texas Rangers jersey for one last time. Young formally announced his retirement Friday after returning to Rangers Ballpark, his baseball home for all but the last of his 13 major league seasons. Stitched Custom Nike Baseball Jerseys . It just didnt show when he hit the ice. 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CHARLOTTE, N.C. -- Panthers quarterback Cam Newton was a full participant in practice Thursday, another indicator the leagues reigning MVP will likely play Sunday against the New Orleans Saints.Coach Ron Rivera said that while Newton remains in the NFLs concussion protocol, its a positive sign that he was able to practice fully. Rivera said he doesnt know when Newtons next meeting with neurologists will be -- or when he might be cleared to play.This is just the next step and its all about how he reacts to everything, Rivera said.Newton declined interview requests on Thursday.Running back Jonathan Stewart, who has missed the last three games with a hamstring injury, also practiced for the second straight day and said he plans to play against the Saints. Left tackle Michael Oher (concussion), cornerback James Bradberry (toe) and defensive tackles Vernon Butler (ankle) and Paul Soliai (foot) did not practice are Rivera indicated they likely will not play.Panthers offensive coordinator Mike Shula said he doesnt anticipate putting any restrictions on the quarterbacks ability to run during the game if he is cleared to play Sunday.The 6-foot-5, 245-pound Newton has run for more touchdowns than any QB in NFL history.Thats his game, Shula said of Newtons ability to run. We will look at him and talk about it, but part of his game and what makes him so good is that. So if hes cleared, well then...Added Rivera: The quarterback is going to play the game the way he plays the game. That is one thing about Cam Newton. We can call the play and he can drop back and take off and run. So we are going to play our offense accordingly.Newton missed Monday nights game against the Taampa Bay Buccaneers after suffering a concussion in a loss to the Atlanta Falcons on Oct.dddddddddddd2.Newton has struggled this season, but playing New Orleans could prove to be a perfect elixir. He has thrown 10 touchdown passes and one interception in his last three games against the Saints.Some of Newtons teammates have complained in the past about him taking too many illegal hits from defenders and that officials dont treat him the same as other quarterbacks in the league.Saints coach Sean Payton believes it is tougher to make calls when it comes to Newton.There are some quarterbacks in this league that move and scramble and look to run, Payton said. One of the things Cam has done is, you see him move for a big play still. In other words, hes still looking down the field because hes got that arm strength in any direction to be running and hit a receiver deeper than most quarterbacks. Hes got rare talent that way. ... He certainly is a threat as a runner but what keeps you awake at night is what he does on third down and in the red area and in the pocket. His arm strength and arm talent, all those things, those are the things that really keep you concerned.Panthers middle linebacker Luke Kuechly said its just good having the excitable Newton back on the field.Cam brings a lot of energy and it is fun to have him out there, Kuechly said. You know when hes out there and when hes not out there.---AP Sports Writer Brett Martel in New Orleans contributed to this report.---AP NFL website: www.pro32.ap.org and http://twitter.com/AP-NFL ' ' '