Early Wednesday morning, a police SWAT team descended on Anderson's home in the 1800 block of Tomlinson Road, roused him from bed, and arrested him.
The motive, the captain said, was over the gains of a video system stolen from a mutual friend of the victim and his alleged killer.
Crump, who had no criminal record, and Anderson, who had two minor run-ins with police, had conspired to steal a PlayStation 3, but then Crump decided to do the job by himself. He sold it for $60, and kept the money.
When Anderson learned of this, he decided to kill Crump, Clark said.
Anderson shot Crump once in the back of the head, Clark said. Crump fell to the ground and Anderson then "stood over top of his longtime friend and fired nine more times, shooting him in the head and killing him," Clark said.
He called the crime "beyond comprehension."
On Aug. 17, Crump left his shift at a Wendy's restaurant on Red Lion Road about 11 p.m. and spent the next night hanging out with Anderson and other friends, bouncing around different houses into the early hours.
At 5:30 a.m. Aug. 19, Anderson and Crump were cutting through the massive construction site on the 10000 block of Northeast Avenue, heading back to Anderson's house, when Anderson decided to kill his friend, a law enforcement source, who did not want to be ientified, said.
When Crump stepped ahead, Anderson pulled out a .22-caliber pistol and fired a single shot into the back of Crump's head.
"He never saw it coming," said the law enforcement source.
The two had been friends for years and hung out together on a daily basis.
Crump's body was found nearly two hours later.
The case gathered wide attention because of its brutality.
Detectives had initially focused on a series of threats posted on Crump's Facebook page, involving a pair of stolen jeans, the law enforcement source said.
But after finding those threats had nothing to do with Crump's killing, they turned their attention back to Anderson and Crump's other friends who had been with him in the hours before he was slain.
Police knew Crump was with Anderson that final night because he had used Anderson's cellphone to call home.
But Anderson had already gotten to his friends, asking them to lie and say how they had left Crump earlier in the night.
Police investigators from the One Squad of the Homicide Unit quickly poked holes in those accounts.
And, they found security video from a nearby Sunoco convenience store that showed Crump, Anderson, and their friends together not long before his murder.
Then, the friends began to tell police the truth. None of them said they witnessed the murder.
Earlier this week, investigators executed a search warrant of Anderson's parent's house, police said. They found the pistol in a kitchen freezer, shoved into an Eggo Waffle box. Ballistics tests pointed to the pistol as the murder weapon.
The SWAT team returned just after dawn Wednesday.
Anderson, who was awaiting arraignment on murder and other charges, did not put up a fight. He confessed to killing Crump, the law enforcement source said.
But he did not offer investigators an explanation to why he would shoot his friend 10 times over a $60 debt.
Clark said the case was a sobering reminder to "be careful how you choose your friends."
At Anderson's Somerton home, a man answering the door declined to comment. Neighbors said the police had visited the house last week.
Crump's family could not be reached for comment.
On Twitter, Crump identified himself as "Gmodcrump" - "GMOD" stands for "get money or die."
Contact Sulaiman Abdur-Rahman at 215-854-4851, firstname.lastname@example.org, or follow on Twitter @sabdurr.