The court sentenced Yevhen Krasnoshchok to life in prison.
His co-defendants -- Maksym Prysyazhnyuk and Artyom Pohosyan -- were sentenced to 15 and 14 years in prison, respectively.
Oksana Makar, 18, died in a hospital three weeks after she was raped, strangled, and set on fire in March in Mykolayiv.
The case shocked many Ukrainians and sparked a number of protests after it was revealed that police initially released two of the suspects, whose parents were former regional government officials.