Found this on the Jamaica Observer website.

1892: Despite Daniel Lucius “Doc” Adams, president of the New York Knickerbockers Base Ball Club, authoring documents titled the Laws of Base Ball in 1857 which established the essentials of the modern game, Alexander Cartwright is credited as the American inventor of modern baseball in 1860. Cartwright dies of natural causes at age 72 on this day.

“This Day In History – July 12”, Jamaica Observer