The incident occurred around 1:00 a.m. on the 5500 block of Broomall Street.
The victim was walking along the street when he was approached by the suspect on a bicycle.
Police say the suspect then shot the man twice, striking him once under the left eye.
The victim was rushed to the hospital in critical condition. Officials say the bullet is lodged in his brain.
Police are investigating.
The victim's name has not been released.