Police arrest man accused of sexual relationship with his daughter . David Johnson is charged with one count of incest in the third trial . New York ( CNN ) -- Police arrested a Columbia University professor accused of having a three-year long sexual relationship with his daughter , officials said . He will face four years in prison , if convicted .
Police arrest man accused of sexual relationship with his daughter . David Johnson is charged with one count of incest in the third trial . He will face four years in prison , if convicted .