A delivery truck driver who crashed into a horse and buggy in Pennsylvania last summer killing a woman and 9-year-old boy has pleaded guilty and paid nearly $800 in fines.

Prosecutors say an investigation found vehicular homicide charges weren't warranted.

Fifty-five-year-old Sherry Croak of Lock Haven originally sought a trial but instead entered the plea Friday. The fines were associated with charges including careless driving resulting in death.

State police said the UPS box truck drifted into the path of the horse and buggy on July 10 in Logan Township, in central Pennsylvania. It then struck a rail that goes alongside the vehicle, causing it to overturn.

Thirty-six-year-old Rachel Beiler of Loganton and her 8-year-old son, David, died at the scene. Four other people in the buggy were injured.