ANKARA, Turkey — One night in May 2018 two men dined with a female university student who had worked for them part-time as a cashier. Afterward they invited her for drinks in one of Ankara’s distinctive office towers.

She agreed, and photographs taken with one of the men’s cellphones show her drinking a bottle of beer in an office on the 20th floor, the lights of the city shining through the window. She appears to be happy.

Sometime later the guards in the ground-floor reception of the Yelken Plaza heard a loud bang. A security video shows it startled them. They asked each other what happened. The time was 3:50 a.m. What they had heard came from a first-floor terrace, a few meters above their heads. The bang was the sound of the young woman hitting concrete after a fall of 66 meters.

The two men are now standing trial in the Turkish capital, charged with detaining Sule Cet (pronounced Shule Chet), 23, against her will, raping and murdering her. Prosecutors have asked for a life sentence for murder and a total of 39 years imprisonment on the lesser charges.