Mevlut Mert Altintas, 22, pumped nine bullets into ambassador Andrei Karlov at an art exhibition centre on Monday evening, before he himself was killed by Turkish police.
Altintas, a member of the Ankara anti-riot police for two- and-a-half years, had been on duty at eight events attended by Erdogan since July, the Hurriyet daily said.
At such events he was part of the second wave of Erdogan's security after the personal bodyguard team of the president, wrote Hurriyet's writer Abdulkadir Selvi, known for his contacts in the ruling elite.
Turkish authorities are now investigating possible links of Altintas to Gulen, including a school he attended that was run by the cleric's group.
Hurriyet's Selvi said that on the day of the July 15 coup, Altintas had called in sick to the police. But it was not clear what he did that night.
The security forces have now detained 13 people over the attack including close relatives of Altintas, Turkish media reports said.
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