Watch out for those Klingons!
"The probe wasn't so long-lasting in its first and only movie role, Star Trek V: the Final Frontier. A trigger-happy Klingon named Captain Klaa blasted Pioneer 10 to smithereens for target practice. Of course that was just a model of the spacecraft."
Taken from here
And I still want to ask the Star Trek writers why the Klingons were so close to the Earth in that movie. Pioneer 10 will not even be a light year a way in 300 years.