It happened on January 17 at the Exxon on the 7100 block of Torresdale Avenue in the city's Tacony section.
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Police say three masked men entered the gas station's mini-mart and broke into the employee side of the counter.
A 66-year-old employee identified as Patro Siboram was shot and killed.
SEE ALSO: Philadelphia police release video of 3 suspects wanted for killing gas station worker
The three suspects have been identified as 38-year-old Chihean aka Chiheam Jones, 25-year-old Robert Miller-Crafter and 21-year-old Keyon Vincent.
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All three male suspects are being charged with murder, robbery and other related offenses.
Siboram leaves behind a wife and son.
The manager of the Exxon gas station says they are adding security gates and will be implementing window service only during certain hours following the killing.
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