Roxborough HS Shooting: 15-year-old ID'd as 4th suspect wanted for murder in connection to deadly shooting

PHILADELPHIA (CBS) -- A 15-year-old has been identified as the fourth suspect wanted in the deadly shooting outside of Roxborough High School last month. Philadelphia police say they are searching for 15-year-old Troy Fletcher in connection with the ambush shooting that left 14-year-old Nicholas Elizalde dead and four other teens injured following a football scrimmage. 

Police say Fletcher is wanted for murder and other related offenses. 

Two suspects, 21-year-old Yaaseen Bivins and 17-year-old Zyheid Jones have been arrested. They are both charged with murder and other related charges. 

Police said Wednesday that a receipt for ammunition was recovered from the SUV used to flee the area of the shooting and tied Bivins to the crime. He is a convicted felon and is ineligible to purchase ammunition. 

"We found a receipt, that receipt left us two ammunition that was purchased by this individual," Chief Insp. Frank Vanore said. "Because of his status as being a felon, we were able to use our federal partners and arrest him for being ineligible to purchase ammunition."  

The getaway vehicle that was recovered also tied another teen to the crime. Dayron Burney-Thorn, 16, is still wanted by police for his role in the deadly shooting. He has also been charged with murder and other related offenses.

"The cops are definitely working 24 hours a day on this case," Mark Fusetti said. 

Mark Fusetti is a retired Sgt. in the Philadelphia Court Warrant Unit. He says finding Fletcher may be a challenge for police because of his young age. 

A 15-year-old, he says, is generally more difficult to law enforcement to digitally track compared to an adult. 

"It's very hard to go off the grid as an adult," Fusetti said. "Just from my experience, it was easier to find them." 

He says adults often leave behind digital fingerprints like when they use credit cards to make purchases, that can be used by police to find them. 

"A juvenile, they don't really have a digital fingerprint other than their social media at this point. So they will need assistance from somebody else to hide," Fusetti said. 

So far, police have identified four suspects in connection with the shooting outside of Roxborough High School. 

The school's football team is set to host its first game since the shooting on Friday afternoon.

You can help police by calling with information. The number is 215-686-TIPS. A $45,000 reward is being offered for information leading to an arrest. 

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• Roxborough High School
• Philadelphia