The Philadelphia Police Department is reviewing its investigation into the 2019 killing of Christopher Williams, after the man charged in that case was acquitted in 2023 and was later accused of killing a city police officer. Eric Lewis, 35, was found not guilty of Williams’ murder after a trial before Common Pleas Court Judge J. Scott O’Keefe. Four people familiar with the case said the prosecution faltered amid problems with the investigation and the presentation of evidence. O’Keefe found prosecutors had not proved Lewis’ guilt. Police now accuse Lewis of shooting two officers on the porch of his West Philadelphia home early Saturday, then firing at nine other responding officers during a standoff that lasted nearly an hour. A SWAT team arrested him, police said. Officers recovered a shotgun and two handguns; one of the handguns had been taken from an officer, according to police. Officer Shane Seiber, 40, a 10-year veteran and father of two, died hours after the shooting. His 33-year-old partner, who has nine years on the force, was shot 12 times and remains hospitalized. The new allegations have renewed scrutiny of the earlier case and brought fresh grief to Williams’ family. Williams was fatally shot on Aug. 31, 2019, on Fallon Street in West Philadelphia. His mother, Darlene Brown, said her son was driving when a double-parked car blocked his way. After he honked and exchanged words with people connected to the car, prosecutors alleged, Lewis fired repeatedly into Williams’ Jeep. A person familiar with the investigation said an officer from the 15th District identified Lewis as the shooter, but did not testify at the 2023 trial. The officer was dating someone in Lewis’ family, the person said. A passenger in Williams’ Jeep testified and identified Lewis, Brown said. Prosecutors also showed video of a Nissan associated with the shooter driving nearby before the killing, she said. However, prosecutors did not present Lewis’ cellphone location records at trial, according to a person familiar with the case. It was unclear whether detectives or prosecutors obtained or analyzed those records. After the acquittal, O’Keefe criticized the investigation in conversations with attorneys and contacted the Police Department’s Internal Affairs Unit, three people with knowledge of the matter said. The outcome of any internal inquiry was not clear. Police spokesperson Sgt. Eric Gripp said the department was reviewing Lewis’ criminal history, the earlier homicide case and related Internal Affairs records. He said the department would provide more information later. The district attorney’s office did not respond to a request for comment. Brown said seeing Lewis’ arrest photo after Saturday’s shooting was shocking. She said she is praying for Seiber’s family but remains angry about how her son’s case was handled. “These kids didn’t have to be fatherless had they done their job back in 2023,” she said. Williams’ sister, Royce Johnson, also questioned the acquittal. “They had him,” she said. Williams worked in construction and as a commercial truck driver, and was remembered by relatives as a devoted uncle who loved taking his nieces and nephews to the pool and on family trips.