ANKARA, Turkey — A Turkish court ordered that a man accused of killing a New York City woman in Istanbul be placed under observation for an evaluation of his mental health on the opening day of his trial Tuesday.
In his first testimony in court, Ziya Tasali, 46, admitted killing Sarai Sierra but denied accusations that he had sexually assaulted her, the private Dogan news agency reported.
Sierra, a 33-year-old mother of two boys, was found dead on Feb. 2, days after her family reported her missing when she failed to return home from a solo vacation in Istanbul. Her body was discovered hidden near the remnants of Istanbul’s ancient city walls, and authorities said she was killed by a blow to the head.
Tasali was arrested near the Syrian border in March. He had been on the run since Sierra’s body was found and was believed to be in hiding in Syria.
During trial, Tasali described himself as a scrap-paper collector with no fixed address.
He admitted fatally hitting Sierra with a rock but disputed charges of sexual assault.
‘‘I was sitting beneath the walls. I had sniffed paint thinner [vapors] and was high,’’ Dogan quoted him as telling the court in Istanbul.
‘‘I approached her and wanted to kiss her. But she hit me with her phone between my two eyebrows. I pushed her and she fell on the ground,’’ he said.
Tasali said Sierra fought him back and hit him in the face with a rock, which made him ‘‘totally lose control.’’ He said he then struck Sierra with a rock.
Questioned about traces of his sperm found over the victim and some of her belongings, Tasali denied rape.
A defense lawyer said he did not believe his client was ‘‘capable of grasping the meaning and results’’ of his actions. Judges hearing the case ordered state forensic medical experts to place Tasali under observation and report back on his mental health, the news agency said.
The court adjourned the trial until Nov. 21.
Prosecutors are demanding a life sentence for Tasali on murder charges as well as 19 years in prison for sexual assault and theft.
Sierra had traveled to Turkey to explore her photography hobby.