Washington DC, July 21 -- A tragic accident has struck the family of reality TV star Duane 'Dog' Chapman. His stepson, Gregory Zecca, allegedly shot his own 13-year-old son, Anthony, in an incident that led to the teenager's death.

According to a report by TMZ, the shooting occurred at an apartment in Naples, Florida, on Saturday, July 19. Police responded to a call about the incident around 8 p.m. and have confirmed it was an "isolated incident." No arrests have been made so far.

The family, through a representative, issued a statement to TMZ, saying, "We are grieving as a family over this incomprehensible, tragic accident and would ask for continued prayers as we grieve the loss of our beloved grandson, Anthony."

Zecca is the son of ...