Wagner Tejeda-Pena, 24, is wanted in the fatal shooting of Loi Nguyen on June 21 at the 4200 block of L Street.
Surveillance video shows the suspect running after Nguyen and shooting him once in the back of the head.
Nguyen was pronounced dead at 5:44 a.m. by medics at the scene.
Police said Tejeda-Pena was also wanted in a serious attack that took place about 15 minutes before the killing in the 1200 block of East Luzerne.
Tejeda-Pena should be considered armed and dangerous, police said.
Anyone with information as to his whereabouts is asked to call Homicide at 215-686-3334 or leave an anonymous tip at 215-686-TIPS.
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https://6abc.com/loi-nguyen-murder-juniata-park-77-year-old-man-killed-morning-walk-killing/12027704/ Loi Nguyen murder: Suspect wanted in deadly shooting of 77-year-old man in Juniata Park section of Philadelphia identified