It happened on May 8 in North Philadelphia.
Police released surveillance video of the suspect on Thursday.
The victims were shot just after 2 a.m. in the 2500 block of West Berks Street.
The videos follow the suspect as he walked three miles that night from the area of 15th and Butler streets, to where the shooting happened, police say.
There is a $20,000 reward for an arrest and conviction in the case.