Azerbaijani serviceman Rahman Eldar oglu Mamedov was killed on May 20 when attempting to penetrate into the territory of Nagorno Karabakh to become the 57th loss of the Azerbaijani army over the past 5 months.

The killed was a warrant officer and served as a sniper.

It's not ruled out that Rahman Mamedov was involved in the murder of a NKR Defense Army soldier on April 28, 2011, Voskanapat.info reported.