A Sherman man has been sentenced to a total of 180 years in prison after a Grayson County jury convicted him on 15 felony counts stemming from the prolonged sexual abuse of a child.

Joseph Ryan Davidson, 39, was sentenced Sept. 25 in the 15th District Court after being found guilty of five counts of sexual indecency with a child by contact and 10 counts of sexual assault of a child, according to Grayson County Criminal District Attorney John Kermit Hill.

The charges followed an extensive investigation into allegations of sexual abuse involving a single victim.