CONCORD, N.H. -- Authorities say a 70-year-old California woman was stabbed to death in a random attack in a New Hampshire hotel lobby by another guest.

Catherine "Kitty" Houghton, of Novato, had traveled to New Hampshire for board meetings at the White Mountain School in Bethlehem. She graduated from there in 1960.

Prosecutors say she was in the lobby of the Hampton Inn in nearby Littleton on Monday evening when a 37-year-old man stabbed her in the neck and torso. She died at a hospital.

Authorities don't know a motive. A Vermont man is in custody.

Houghton was a trustee at the White Mountain School and a retired business counselor with the U.S. Foreign Service.