Police are investigating whether a serial killer is on the loose in Phoenix after five people were murdered in the Maryvale neighborhood since April, NBC News reported.
All the victims were shot dead outside their homes, near their cars, on weekend evenings in the working-class neighborhood.
Those details and the lack of obvious motive in each case led investigators to link the slayings, but multiple law enforcement sources confirmed there is also physical evidence tying them together.
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Phoenix Police Sgt. Jon Howard told NBC News that investigators can't say for sure if it's a single killer or a group working together. There are no known links between the victims, so police have not determined how the shooter chooses the targets.
Victims include Horacio de Jesus Pena, 32, Diego Verdugo-Sanchez, 21, Manuel Castro Garcia, 19, Angela Linner, 31, Maleah Russell, 12.