Mysterious death of CDC worker Timothy Cunningham ruled suicide by drowning: Medical examiner

Timothy Cunningham disappeared in February and was found dead in April.

Cunningham, 35, a Harvard graduate and commander in the U.S. Public Health Service who responded to public health emergencies including the Ebola and Zika viruses, disappeared Feb. 12 after saying he was sick before leaving his Atlanta office.

All of Cunningham's belongings, including his dog, were left at his home.

Cunningham's concerned family reported him missing, and after weeks of searching, authorities found his body April 2 along the banks of the Chattahoochee River.

The medical examiner has previously said there were no signs of foul play.