SPARTANBURG, S.C. (AP) — Sheriff's deputies in South Carolina searched Wednesday for two more possible victims connected to a man who pleaded guilty last year to killing seven people.

Spartanburg County Sheriff Chuck Wright said the search along Interstate 26 came after he received a "second-or-third-hand tip" from a documentary film crew about more killers connected with Todd Kohlhepp, who previously lived in the area.

About 20 deputies and a dog trained to sniff for cadavers were searching in heavily wooded areas, even though Wright said he was not hopeful the tip would pan out.

"Because I know he's killed seven, I feel like we need to check this out," said Wright, who also worries about giving the killer unwarranted attention.

"I don't want it to be one of those things, he wants to stay relevant," the sheriff said.

Kohlhepp is serving seven consecutive life sentences in a Columbia prison for his guilty pleas last year.

The documentary crew was given access to the search while other news media were kept away.

"Where they got their tip, I don't know," Wright said about Wednesday's search.

The documentary crew was not immediately identified.

Nothing had been found by midday Wednesday.

Kohlhepp's crimes were discovered when police rescued a woman being held inside a storage container on his property.

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