TOKYO (Reuters) - Shares in Takata Corp fell 5 percent in Thursday morning trade to 5-1/2 year lows after the first official confirmation that a defective caused the death of a Florida woman in a September accident.

According to a final autopsy report released by the Orange-Osceola Medical Examiner's office, Hien Tran, was killed by shards from a ruptured Takata-made air bag in her Honda Accord.

She died on Oct. 2.

Tran's family on Monday filed a wrongful-death lawsuit against Takata and Honda.

Separately, two U.S. senators on Wednesday raised the possibility of a sixth fatality linked to Takata's air bags.

(Reporting by Chang-Ran Kim; Editing by Edwina Gibbs)