Actress Lynda Carter wasn't expecting trouble, but she found it on the Potomac River in Washington.

The "Wonder Woman" star was rowing on the river Wednesday when she spotted the body of a woman floating face down in the water, according to Starpulse.com.

Carter immediately called 911 after her gruesome find, Starpulse.com reported.

D.C. police on Friday identified the woman as 47-year-old Helen Johnstone.

The death is under investigation, and an autopsy will be performed by the chief medical examiner's office.

Click here to read more on this story from Starpulse.com.

The Associated Press contributed to this report.