Police are investigating a crash that killed a mother of three Saturday night as she walked home from a shopping center near her home in Camden County. Quetzy Rentas-Irizarry, 44, of Bellmawr, was walking from the Brooklawn Shopping Center when she was struck by a vehicle shortly before 8 p.m., according to her family. Brooklawn police on Monday confirmed the fatal crash but referred all questions to the Camden County Prosecutor’s Office. Andrew Kramer, spokesman for the prosecutor’s office, said he was gathering details about the crash and did not immediately comment. “We’re still waiting for…