Tiger Woods Biography Claims Golfer Is A 'Narcissist' After Ex Elin Welcomes Baby

By 2007, the once personable Woods, now 43, had changed, Garrity has claimed.

"A pathological narcissist. All of his human relationships were transactional. If you couldn't help him achieve his goals, he had no use for you. He'd walk past and look right through you," Garrity told the author for the tome.

Sampson also brands Woods a cheapskate.

The golfer is allegedly known for being a bad tipper and underpaying one of his coaches, the book charges.

When he was an amateur, Woods and his father, who died in 2006, would allegedly stay at the houses of golf club members rather than paying for their own accommodations, according to the book.

Dr. Al Oppenheim, who twice hosted Woods and his father, Earl, told Sampson, "They assumed we'd buy them breakfast, lunch and dinner... which we did, but they were most unappreciative. They never once said thank you."

Roaring Back also has claimed that Hank Haney, who coached Woods from 2004 until 2010, was paid just $50,000 a year.

According to the Woods' bio, Haney would have to use money out of his salary to cover his own accommodations while travelling with the multi-millionaire golfer.

Sampson wrote that Woods claimed he never carries cash, and noted, "Narcissists don't mind spending other people's money because we're in their debt already, and they find it hard to say 'thank you' for the same reason."

Woods allegedly thought about becoming a Navy SEAL after flopping at the 2004 U.S. Open.

The confident star even got training with the special ops unit at age 31, although SEALS had to be no older than 28.

Woods allegedly told his caddie that the SEALS would make a "special exemption" just for him, it has been reported in another book called Out of the Rough.

Sampson believes Woods' father made him feel invincible.