Published: Aug 04, 2011 11:18 AM EDT
Updated: Aug 04, 2011 10:25 AM EDT

OKLAHOMA CITY (AP) - When an FBI agent pleaded several years ago for help finding notorious skyjacker D.B. Cooper, he off-handedly wondered if the suspect might be someone's "odd uncle."
 
An Oklahoma City woman now says she's certain her uncle hijacked that plane in 1971 and parachuted away over the Pacific Northwest with $200,000 ransom.
 
Marla Cooper tells The Associated Press she was only 8, but recalls her uncle saying their money troubles were over. He died in 1999.
 
Cooper says her father mentioned the heist before his 1995 death, and her mother recalled it in 2009. Marla Cooper says she only recently reached out to the FBI.
 
The FBI says it's following a "credible" lead on a new suspect who died 10 years ago but won't say if the tip came from Cooper.