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.
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.
All three male suspects are being charged with murder, robbery and other related offenses.
On Saturday, family and friends gathered to remember Siboram.
"He was a nice guy, I mean I would come in and talk to him about sports, news, anything in the community," said Greg Bucceroni, a friend.
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SEE ALSO: 3 suspects charged with murder in killing at Philadelphia gas station
3 suspects charged with murder in killing at Philadelphia gas station
"When I met him for the first time I was so surprised. I was so surprised that how can a person be so positive you know?" added Pradeep Mohapatra.
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.
RELATED: Check the 6abc Neighborhood Safety Tracker