LOS ANGELES — Merv Griffin, the big band-era crooner turned impresario who parlayed his "Jeopardy" and "Wheel of Fortune" game shows into a multimillion-dollar empire, died yesterday. He was 82.

Griffin died of prostate cancer, according to a statement from his family that was released by Marcia Newberger, spokeswoman for The Griffin Group /Merv Griffin Entertainment.

From his beginning as a $100-a-week San Francisco radio singer, Griffin moved on as vocalist for Freddy Martin's band, sometime film actor, and TV game- and talk-show host, and made Forbes' list of richest Americans several times.

His "The Merv Griffin Show" lasted more than 20 years, and Griffin said his capacity to listen contributed to his success.

"If the host is sitting there thinking about his next joke, he isn't listening," Griffin said.

But his biggest break financially came from inventing and producing "Jeopardy" in the 1960s and "Wheel of Fortune" in the 1970s. After they had become the hottest game shows on television, Griffin sold the rights to Coca Cola's Columbia Pictures Television Unit for $250 million in 1986, retaining a share of the profits.

"My father was a visionary," Griffin's son, Tony Griffin, said yesterday. "He loved business and continued his many projects and holdings even while hospitalized."

In recent years, Griffin also rated frequent mentions in the sports pages as a successful race horse owner. His colt Stevie Wonderboy, named for entertainer Stevie Wonder, won the $1.5 million Breeders' Cup Juvenile in 2005.

Griffin started putting the proceeds from selling "Jeopardy" and "Wheel" in treasury bonds, stocks and other investments, but went into real estate and other ventures because "I was never so bored in my life."

"I said 'I'm not going to sit around and clip coupons for the rest of my life,' " he recalled in 1989. "That's when Barron Hilton said 'Merv, do you want to buy the Beverly Hilton?' I couldn't believe it."

Griffin bought the slightly over-the-hill hotel for $100.2 million and completely refurbished it for $25 million. Then he made a move for control of Resorts International, which operated hotels and casinos from Atlantic City to the Caribbean.

That touched off a feud with real estate tycoon Donald Trump. Griffin eventually acquired Resorts for $240 million, even though Trump had held 80 percent of the voting stock.

"I love the gamesmanship," he told Life magazine in 1988. "This may sound strange, but it parallels the game shows I've been involved in."

In 1948, Freddy Martin hired Griffin to join his band at Los Angeles' Coconut Grove at $150 a week. With Griffin doing the singing, the band had a smash hit with "I've Got a Lovely Bunch of Coconuts," a 1949 novelty song sung in a Cockney accent.

Doris Day and her producer husband, Marty Melcher, saw the band in Las Vegas and recommended Griffin to Warner Bros., which offered a contract. After a bit in "By the Light of the Silvery Moon," starring Day and Gordon MacRae, he had a bigger role with Kathryn Grayson in "So This Is Love." But after a few more trivial roles, he asked to get out of his contract.

In 1954, Griffin went to New York where he appeared in a summer replacement musical show on CBS-TV, a revival of "Finian's Rainbow," and a music show on CBS radio. He followed with a few TV game-show hosting jobs. His glibness led to stints as substitute for Jack Paar on "Tonight."

When Paar retired in 1962, Griffin was considered a prime candidate to replace him. Johnny Carson was chosen instead. NBC gave Griffin a daytime version of "Tonight," but he was canceled for being "too sophisticated" for the housewife audience.

Westinghouse Broadcasting introduced "The Merv Griffin Show" in 1965 on syndicated TV. Griffin never underestimated the intelligence of his audience, offering such figures as philosopher Bertrand Russell, cellist Pablo Casals and Pulitzer Prize-winning writer-philosopher-historians Will and Ariel Durant as well as movie stars and entertainers.

He was also a longtime friend of former President Reagan and his wife, Nancy.

"This is heartbreaking, not just for those of us who loved Merv personally, but for everyone around the world who has known Merv through his music, his television shows and his business," Nancy Reagan said in a statement. "Ronnie and I knew Merv for more years than I can even remember, more than 50 I'm sure."

Mervyn Edward Griffin Jr. was born in San Mateo, south of San Francisco on July 6, 1925, the son of a stockbroker. An aunt, Claudia Robinson, taught him to play piano at age 4, and he soon was staging shows on the back porch.

"Every Saturday I had a show, recruiting all the kids in the block as either stagehands, actors and audience, or sometimes all three," he wrote in his 1980 autobiography. "I was the producer, always the producer."

Griffin is survived by his son, daughter-in-law, Tricia, and two grandchildren.