San Diego ? A volunteer firefighter who helped battle one of last month’s wildfires was sent to prison after it surfaced that he pleaded guilty years ago to setting several destructive wildfires.

Steven Santos Robles Jr. violated parole by failing to tell his parole officer he had joined the Ranchita Volunteer Fire Department, the San Diego Union-Tribune reported Saturday. He was sent back to prison Oct. 29.

Robles is not suspected of setting any of last month’s fires, state fire officials said.

“We have had no other problems with him until this point,” said Jerome Marsh, a spokesman for the state parole department.

Robles, 30, pleaded guilty a decade ago to setting seven wildfires that charred thousands of acres and destroyed about a dozen homes while he was a volunteer firefighter.

He was sentenced to 18 years in prison but was paroled in May.