Maharishi Mahesh Yogi, a guru to the Beatles who introduced the West to transcendental meditation, has died at his home in the Dutch town of Vlodrop, a spokesman said Tuesday. He was thought to be 91 years old. "He died peacefully at about 7 p.m.," said Bob Roth, a spokesman for the Transcendental Meditation movement that the Maharishi founded. He said his death appeared to be due to "natural causes, his age." Once dismissed as hippie mysticism, the Hindu practice of mind control that Maharishi taught, called transcendental meditation, gradually gained medical respectability.