DOVER, Del. — Delaware State Police are investigating the death of a Sussex County prison inmate being held on drunken-driving charges.

Authorities say 54-year-old Lloyd Lindner of Bridgeville arrived at Sussex Correctional Institution shortly after 3 a.m. Saturday. An ambulance was called shortly after 6:30 p.m. that evening after he fell from a second floor railing.

Police are investigating the death as an apparent suicide.

DOC spokeswoman Jayme Gravell said Lindner stood on top of a railing before falling head first to the floor below. It’s unclear how he was able to get on top of the railing, but Gravell said prison staff asked him to get down before he fell.

DOC officials say Lindner had been held in custody at the same prison facility twice before, in 2014 and 2015.

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This story has been corrected to show the last name of the inmate is Lindner, not Lidner.