CAMBRIDGE, Mass. -- The Boston Strangler's brother had blood drawn publicly Thursday in an attempt to prove that Albert DeSalvo was not the notorious killer.

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Richard DeSalvo said that he will give the samples to Attorney General Tom Reilly's office if officials give them information the family said that they need for an independent investigation.

"I honestly swear on a stack of bibles, that there is no way on the world that he was the Boston Strangler," Richard DeSalvo said.

For nearly four decades, Richard DeSalvo has endured the burden of sharing the name of the man known as the Boston Strangler. He has long maintained that Albert DeSalvo was not the infamous killer of 13 women in the '60s.

At a news conference Thursday, a doctor took blood samples from Richard DeSalvo's finger. Then the doctor used a cotton swab in his mouth. Richard DeSalvo's DNA may be compared to semen samples found on Mary Sullivan, the Strangler's last victim.

Reilly's office has the evidence and Richard DeSalvo's attorney said that the family wants to make a trade.

"We are hopeful today that Tom Reilly, or his representative, will appear with a semen sample," Richard DeSalvo's attorney Elaine Whitfield Sharp said. "He isn't here yet, but we are not yet giving up hope."

Reilly did not show up, but he did release a statement.

"If they are interested in a professional investigation seeking the truth, they will give us a sample so that we can continue with DNA testing. Today's public spectacle did nothing to further those aims," Reilly said.