Mutlu Kaya appeared on the show in April
Turkish authorities have charged an ex-boyfriend with the shooting of a young talent show contestant.
Mutlu Kaya, 19, is in a critical condition after being shot on Monday in Diyarbakir province, a conservative region in south-east Turkey.
A gun was fired from the garden and through a window of her house as she rehearsed.
Her ex-boyfriend, identified as Veysel E, has been charged with attempted murder.
Local media reported he had denied the accusation, while being "opposed to Mutlu Kaya's participation on the show".
The 26-year-old was one of three men detained by authorities, but the other two were later released.
Ms Kaya had reportedly received death threats for singing on Sesi Cok Guzel - roughly translated as Sounds Beautiful - a popular song contest similar to shows like Britain's Got Talent and The Voice.
She had been mentored by Sibel Can, one of Turkey's best-known folk singers, who posted a picture of Ms Kaya on Instagram after the shooting.
"My beautiful girl Mutlu, how could they wound you?" read the caption. "I am very sad."
In March, Ms Can had visited Ms Kaya at the school canteen where she worked, in order to make sure she joined her team in the competition.
The Posta newspaper reported on Sunday that Ms Kaya had received death threats after appearing on the show.
"I am afraid," she was quoted as telling the show's production team.
Her father, Mehmet Kaya, said: "I just want my daughter to be healthy and don't want anything else."