From History of Allegheny County, Pennsylvania:
John and Mary (Dillon) O'Keefe, also natives of that county (Kerry, Ireland). John O'Keefe, who was a farmer, immigrated to America with his family in 1852, landing in New York; thence came to Pittsburgh, and died at a ripe old age, in 1869; his wife died in 1846.
Have you taken a DNA test? If so, login to add it. If not, see our friends at Ancestry DNA.