Jose Compean will address the Murrieta Temecula Republican Assembly's dinner meeting on July 3. The assembly invited Compean and his family to ride the assembly's parade entry the next day.
The man shot, Osvaldo Aldrete Davila, was later imprisoned for marijuana smuggling.
"We felt (Compean) was unrightly put in prison for doing the right thing," said assembly President Bob Kowell. "They maybe were wrong on an administrative issue ... (but) 11 or 12 years in prison for that is just obscene."
The assembly always has an entry in the Fourth of July parade, and Compean was asked to take part because he would be in town for the dinner, Kowell said.
Every year Temecula invites groups to take part in the parade, which runs through Old Town. The winner of the Good Neighbor award serves as grand marshal.
Herman Parker, the city's community services director, said he didn't object to Compean taking part.
The assembly grabbed headlines in March for inviting anti-gay rights activist Scott Lively to speak. Lively wrote a book alleging ties between homosexuals and Nazi Germany leadership.