WATCH: Police say they've arrested a suspect in the slayings of 9 people in 3 weeks

ABC News -

ABC News—Phoenix authorities believe that Cleophus Cooksey went on a killing spree and that there may be more victims.

WATCH: Homicide suspect linked to 9 murders in 3 weeks: Police. Cleophus Cooksey Jr., 35, has been in custody since the last of the nine alleged killings on Dec. 17 when he allegedly shot and killed his mother and stepfather, police said.