PHOENIX (AP) — The key to cracking a series of fatal shootings in the Phoenix area in 2017 came when police were called to a blood-spattered apartment where they arrested a man who was suspected of killing his mother and stepfather.

Authorities say evidence found there linked to four other killings. Police found a gun used in several of them, a necklace belonging to a victim and the vehicle keys of a woman whose partially nude body was found in an alley.

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