A coroner has been unable to determine whether a woman, found dead at the foot of Bennerley Viaduct in Ilkeston, jumped or fell to her death.
Carole Moore, 55, was seen leaving her Springfield Gardens home in icy weather on February 9, wearing pyjamas, dressing gown and slippers, prompting her worried parents to contact police.
Officers found her four days later at the foot of the 60ft high viaduct. She had suffered injuries consistent with a fall.
Derby Coroners Court was told she must have climbed over a four-foot fence at the top of the viaduct.
NHS administrator Miss Moore suffered a "complete breakdown" in 2002 due to stress at work but her brother David Moore said his sister's mental health had improved considerably until a slight relapse around the time of her birthday in January this year.
Assistant deputy coroner Paul McCandless was told that three days before her death she was prescribed anti-depressants by her GP.
Mr McCandless recorded an open verdict.
He said: "I cannot say without any doubt that, even when climbing over the lattice work fence, that she had this clear intention at all times to take her own life."