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Abraham, a sophomore at Abington High School, was fatally shot on the 2400 block of North Clarion Street on May 29, Daily Voice reported.
Police are now circulating security footage that they say shows the killer in the hour before the shooting.
In clips timestamped at 11:20 p.m., the suspect is seen riding around on a light-colored mountain bike, sitting on a stoop, and briefly disappearing inside a residence.
Around 12:04 a.m., he is seen riding his bike and then appearing to brandish a handgun on foot.
In the final clip at 12:05 a.m., the suspect is seen heading in the same direction that Abraham was headed less than a minute earlier. Police have said the 16-year-old was shot just minutes later around 12:10 a.m.
The suspect is described as a black man in his 30s or 40s, about 6 feet tall with a "medium" build. He was wearing all dark clothing except for a lighter undershirt that stuck out from under his hem, and he appeared to have a set of keys hanging from the rear of his pants, according to police.
His mountain bike might have been white or silver and he "appeared to frequent" an "unlicensed establishment" at 2629 N. 13th Street.
The suspect is considered armed and dangerous and anyone with information is asked to call PPD at 215-686-8477 or submit a tip anonymously online. A $20,000 reward is offered.
In a GoFundMe campaign, those close to Abraham called him ambitious and said the high school sophomore had been looking forward to getting a summer job at a car dealership.
No arrests have been made in his murder and police have yet to reveal a possible motive.
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