In the "stop-snitching" era, helping the police is a rarity.
But because of assistance from the community, police said, four murder suspects are behind bars.
"When we get time to work on cases and we get cooperation, we can solve any case," said Homicide Lt. Philip Riehl.
Cops arrested Nathan Bundy, 29, in the shooting death of Craig Young, 41, a North Philadelphia store owner, who was hit by a stray bullet Thursday night.
Young, a father of two young children, was taking a break outside his store at 23rd and Jefferson streets when a shootout erupted, police said.
A stray bullet hit Young in the chest, and he died later at Hahnemann University Hospital.
In another slaying, police arrested 16-year-old Johnny Brown on Saturday and charged him with killing Anthony DiAntonia, 60, who was gunned down inside his furniture store in Southwest Philadelphia shortly before 2 p.m. last Tuesday.
Cops said the killing apparently was the result of a robbery attempt.
Police also charged Rashine Brooks, 29, in the death of 18-year-old Omar Kennedy. Police said Brooks shot Kennedy five times after a struggle over a gun during a robbery attempt.
Meanwhile, Teddy Ramirez, 56, was arrested Friday in the slaying of Ramon Olivo, 30, of North Philadelphia.
Cops said Ramirez shot Olivo in the face, thigh, and chest on Tioga Street near 8th on Nov. 24.
According to cops, Ramirez was staying at a house on 7th Street near Erie Avenue, in North Philadelphia. When they arrived with a warrant for his arrest, Ramirez ran into the house.