Forty-four-year-old Michael Showers played a police officer in the series. Authorities say his body was found in the river on Wednesday after it was spotted by the captain of the riverboat Natchez.
John Gagliano, chief investigator for the Orleans Parish Coroner's Office, said Friday that there was no trauma to Showers' body. He says results from toxicology tests for drugs and alcohol will take about three weeks.
Showers also acted in "The Vampire Diaries," "Traffic," and the new action thriller "Colombiana."