Police are investigating two separate fatal shootings that happened just one hour apart overnight.According to investigators, a 15-year-old boy was shot just after midnight at the intersection of Freeman Street and Prospect Avenue. He suffered a gunshot wound to the neck and was taken to Bronx Lebanon Hospital, where he was pronounced dead. Police haven't released the victim's name.In a separate case, a 27-year-old man, identified as William Samuels, was found shot to death on Randall Avenue. Police say a second 19-year-old male victim was shot in the foot but is in stable condition at Jacobi Medical Center.No arrests have been made in the shootings.