Story highlights A second militant group claims responsibility for the killing

Samiullah Afridi had represented Dr. Shakeel Afridi, who was convicted of treason

Peshawar, Pakistan (CNN) A former lawyer for the doctor who helped the CIA look for Osama bin Laden has been shot dead in northwest Pakistan, police said.

Unidentified gunmen attacked the lawyer, Samiullah Afridi, in his car near the city of Peshawar on Tuesday, said Mian Saeed, a police superintendent in Peshawar.

Two different militant groups claimed responsibility for the killing.

The lawyer had represented Dr. Shakeel Afridi, who was convicted of treason in 2012 by a Pakistani tribal court and is now serving a 23-year prison sentence . The two men are not related.

The doctor helped the CIA set up a fake vaccination campaign in an attempt to collect DNA samples from relatives of Bin Laden in an effort to verify his presence in a compound in the Pakistani city of Abbottabad.

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