FOR THE LONGEST HOST OF A GAME SHOW WITH ONE MORE TO GO. IT FEELS LIKE HE'S ALWAYS BEEN ON OUR TV SCREENS. >> PAT SAJAK AND VANNA WHITE. >> Reporter: BUT TONIGHT PAT SAJAK WILL SIGN OFF AFTER MORE THAN FOUR DECADES. >> I LOVE YOU, PAT. >> AN EMOTIONAL GOOD-BYE FROM THE OTHER HALF OF THE SHOW'S ICONIC DUO. >> 8,000 EPISODES WENT BY LIKE THAT. >> Reporter: VANNA WHITE PAYING TRIBUTE TO PAT SAJAK, SHARING MEMORIES OF THEIR WORK AND FRIENDSHIP. >> WE WATCHED OUR CHILDREN GROW UP TOGETHER. WE HAVE TRAVELED ALL OVER THE WORLD. WHAT AN INCREDIBLE AND UNFORGETTABLE JOURNEY WE'VE HAD. AND I HAVE ENJOYED EVERY MINUTE OF IT WITH YOU. >> Reporter: THE BELOVED HOST ANNOUNCED HE WAS STEPPING DOWN EARLIER THIS YEAR. WITH RYAN SEACREST TO TAKE OVER HOSTING DUTIES. PAT SAJAK HAS HAD A LEGENDARY AND LONG RUN. >> MY NAME IS PAT SAJAK, AND I HAVE BEEN FORTUNATE ENOUGH TO WANDER ON TO THE SET. >> Reporter: WHEN HE FIRST TOOK OVER, RONALD REGION WAS PRESIDENT AND E.T. HAD JUST CAME OUT IN THEATERS. ANCHORED BY THE BELOVED HOST'S HUMOR. >> NOW, I WANT YOU TO UNDERSTAND WE'RE LAUGHING WITH YOU. >> Reporter: AND CONNECTION WITH THE CONTESTANTS. >> DID SHE JUST BUTT BUMP ME? >> Reporter: THE SHOW GROWING AND INNOVATING OVER THE YEARS, HITTING ITS FIRST MILLION DOLLAR WINNER IN 2008. >> GOT TO GO SHOPPING FOR THAT DOG. >> OH, MY GOD! >> Reporter: IT'S OUR BIGGEST PAYDAY YET. BUT THE BACKBONE WAS ALSO PAT SAJAK'S CHEMISTRY WITH WHITE. >> I'M EXCITED AND HAPPY. >> THAT'S RIGHT. THIS IS A FAMILY YOU WILL SOON KNOW TO GROW AND LOVE. >> Reporter: THE TWO BECAME POPULAR ICONS AND FRIENDS. WHITE PLANS TO STAY ON, EXTENDING HER CONTRACT LAST YEAR. NOW TELLING HER COSTAR HIS LEGACY WON'T BE FORGOTTEN. >> AS THIS CHAPTER OF OUR LIVES IS COMING TO AN END, I KNOW YOU WILL STILL BE CLOSE BY. >> I MEAN, WHAT A LEGACY. >> YOU HAVE TO WATCH THAT. >> HE LEAVES. THIS MORNING WE WERE TALKING ABOUT IT DOWNSTAIRS, AND IT IS ONE OF THE FEW THINGS I NOTICE WHERE THE GIRL WHO DOES MY HAIR IS YOUNGER OR DYLAN'S GRANDMOTHER WAS ON "WHEEL OF FORTUNE." >> WE WERE WATCHING LAST NIGHT, AND HE WAS SO FUNNY. HE HAD A LINE WHERE A WOMAN WAS ABOUT TO SOLVE IT. HE SAID, DON'T YOU WANT MONEY? TAKE A FEW MORE LETTERS. HE'S SHOWING NO SIGNS OF SLOWING DOWN. HE COULD DO IT. >> AND IT IS ONE OF THOSE THINGS WHERE IT LOOKS EFFORTLESS, BUT NOT AT ALL. >> WE HAVE BEEN ON THE SET AND BEHIND THE SCENES. I WAS ACTUALLY ON WITH MY MOM. >> WOW! >> HE COULD NOT HAVE BEEN NICER. YOU KNOW, HE'S JUST -- I WISH THEM ALL THE BEST. >> AND IT IS GREAT THAT VAN THAT IS STICKING AROUND. >> FOR SURE. >> THERE YOU GO. SOUTH CAROLINA! >> GOD'S COUNTRY. >> GOD'S COUNTRY. >> ONE MORE SHOW. WE WISH THEM ALL THE BEST. >> THANK YOU, SHEINELLE. MR. ROKER, WHAT YOU GOT? >> BY THE WAY, HE STARTED AS A TV