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Phoenix serial killings suspect left behind shell casings

FILE - This photo and sketch combo shows an undated file photo provided by the Maricopa County Sheriff's Office of Aaron Saucedo, left, and a July 2016 composite sketch provided by the Phoenix Police Department showing a suspect in a series of fatal shootings in Phoenix. A judge has ordered the release of the court record that documents the evidence police have gathered in the investigation of Saucedo, accused in a string of serial killings, according to the judge's ruling made public Thursday, May 18, 2017. (Maricopa County Sheriff's Office and Phoenix Police Department via AP,File)
FILE - This photo and sketch combo shows an undated file photo provided by the Maricopa County Sheriff's Office of Aaron Saucedo, left, and a July 2016 composite sketch provided by the Phoenix Police Department showing a suspect in a series of fatal shootings in Phoenix. A judge has ordered the release of the court record that documents the evidence police have gathered in the investigation of Saucedo, accused in a string of serial killings, according to the judge's ruling made public Thursday, May 18, 2017. (Maricopa County Sheriff's Office and Phoenix Police Department via AP,File) FILE - This photo and sketch combo shows an undated file photo provided by the Maricopa County Sheriff's Office of Aaron Saucedo, left, and a July 2016 composite sketch provided by the Phoenix Police Department showing a suspect in a series of fatal shootings in Phoenix. A judge has ordered the release of the court record that documents the evidence police have gathered in the investigation of Saucedo, accused in a string of serial killings, according to the judge's ruling made public Thursday, May 18, 2017. (Maricopa County Sheriff's Office and Phoenix Police Department via AP,File)

PHOENIX (AP) – The man arrested in a string of serial killings left behind bullet casings at each crime that authorities tested and linked him to the shootings, police said in documents released Friday that provide the most detailed narrative to date about a case that unnerved Phoenix neighborhoods last year.

The documents were released after media organizations including The Associated Press, Arizona Republic and Phoenix TV stations went to court in a bid to get prosecutors to unseal the evidence that led to the arrest of 23-year-old Aaron Saucedo in nine killings.

Police say that in one of his killings, Saucedo opened fire on a man walking along a Phoenix street on New Year’s Day 2016 and then got out of his car and kicked him twice before calmly driving away. The documents also say video footage captured from a July 2016 shooting determined the shooter’s car was a 5-series BMW – the same model that Saucedo drove.

Saucedo emerged as a possible culprit just weeks after the last of the nine shootings. Two witnesses told authorities in August 2016 that Saucedo matched a composite sketch of the suspect and drove a BMW similar to one seen at the crimes. Homicide detectives interrogated him in December, about five months before he was arrested.

In the interview, Saucedo told authorities he drove a BMW and owned a 9mm handgun, which he said had been stolen.