Dennis O'Neill (baseball)
Dennis O'Neill  (November 22, 1866 – November 15, 1912) was a Major League Baseball player. He played for the St. Louis Browns in June, 1893. References

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1866 births
1912 deaths
19th-century baseball players
Holy Cross Crusaders baseball coaches
Major League Baseball first basemen
St. Louis Browns (NL) players
Baseball players from Holyoke, Massachusetts