The men were friends since high school, their families told the gendarmerie forces.
According to the authorities, 24-year-old Neşet Dalgın, 20-year-old Ümit Zangal and his relative, Serkan Zangal, 23, who lived in the Alaşehir district, went to meet with Muharrem Zengin, 20, who lived in the Kestelli neighborhood on Jan. 29.
After spending some time together, the four drove to the Ataşehir neighborhood, pulling up near an empty lot.
Neighborhood residents later heard gunshots from the lot, immediately informing security forces.
The gendarmerie arriving at the scene found the four dead with gunshots in their heads.
Initial investigation at the scene found the four were shot in their heads, but officers later determined Zengin’s neck was also broken.
A provincial prosecutor determined the unlicensed shotgun used in the murder belonged to Zengin’s father, with suspicions that it could have been a mass suicide.
But their families said it may not have been a mass suicide and that it could have been the result of a quarrel between the four which later turned violent where one killed the three and then killed himself.
Local media claimed that Zengin is a relative of Mehmet Zengin, a footballer who plays for Turkish Süper Lig team Trabzonspor.
An investigation into the murder is ongoing.
Hurriyet Daily News