TUCSON, AZ — A 79-year-old Arizona woman has been arrested and charged with first-degree murder in the death of her stepfather, whose remains were discovered in the desert 50 years ago, authorities said Thursday.
Carol Ann Beall was taken into custody Thursday in connection with the 1975 killing of William Reginald Sipfle, according to the Pima County Sheriff’s Department. The arrest comes after forensic genealogy helped investigators identify remains found at a county waste transfer station in October 1975. Prosecutors allege Beall has been living in Sipfle’s home and collecting his pension and Social Security benefits for five decades, accumulating between $250,000 and $600,000 from his death. Beall, a retired U.S. Postal Service employee with no prior criminal record, is being held on $500,000 bond at the Pima County jail.
The case remained cold for nearly five decades until advanced DNA testing and genealogy analysis cracked the mystery in late 2025. Human remains discovered at the Pima County Waste Transfer Station in October 1975 belonged to a man, but investigators could not identify the victim due to technological limitations at the time. “You had no idea what you have in front of you ’cause you don’t know who this is, there’s no fingerprints to be had,” Pima County Sheriff Chris Nanos told local media. The sheriff’s department partnered with a company specializing in forensic genealogy, which led investigators to track down distant relatives of the deceased. Through this process, they connected with Sipfle’s granddaughter, who had been searching for information about her missing grandfather.
William Reginald Sipfle was 73 years old when he disappeared in 1975, but his family never filed a missing persons report, according to Sheriff Nanos. “They knew he had up and disappeared,” the sheriff said. Investigators were able to positively identify the remains as belonging to Sipfle through DNA analysis and genealogical research. The breakthrough came when the forensic genealogy work connected them to a potential match who had a missing grandfather with no record of what happened to him. This led detectives to Sipfle’s granddaughter, who confirmed the family connection. Beall entered the investigation when authorities learned she worked at a museum in the desert area where the remains were originally discovered, creating a geographic link between the suspect and the crime scene.
During Beall’s first court appearance Thursday, conducted virtually from jail, prosecutors revealed the extent of the alleged financial fraud. The state claimed that Beall’s primary source of wealth came from her stepfather’s death, with the retired postal worker collecting Sipfle’s pension and Social Security benefits for approximately 50 years. Court documents indicate she continued living in Sipfle’s residence throughout this period while receiving the fraudulent payments. The financial benefits allegedly ranged from $250,000 to $600,000 over the five-decade period. Beall’s defense attorney noted that she has never been arrested before and characterized her as having no criminal history prior to these charges. The long-term nature of the alleged fraud suggests a calculated effort to conceal Sipfle’s death while benefiting financially from his disappearance.
The Sipfle family expressed mixed emotions about the resolution of the decades-old mystery in a statement to local media outlets. “The family is relieved to have closure regarding the whereabouts of our grandfather, William Reginald Sipfle, with the positive identification of our grandfather’s remains,” the family said. They acknowledged the difficulty of processing new information about their grandfather’s death while “reliving painful memories of his disappearance and of our father’s efforts to locate his father.” Sheriff Nanos emphasized the importance of providing answers to grieving families, even after so many years. “This is somebody’s loved one who’s vanished from the planet,” he said. “And because of this science, we’re able to put it together.” The sheriff praised the forensic genealogy lab for helping authorities learn not only who Sipfle was but potentially how his death occurred.
The investigation into Sipfle’s death remains active as authorities work to uncover additional details about the 1975 killing. Sheriff Nanos acknowledged that while significant progress has been made in identifying the victim and arresting a suspect, many questions remain unanswered. “We’re smart enough to know that we’re not gonna have all of the answers, but they’re out there,” he told reporters. The case represents a growing trend of cold cases being solved through advances in DNA technology and genealogical databases. Beall’s arrest was made in the 7800 block of North Star Grass Drive, near West Magee Road and North Camino de Oeste in Tucson. Her next court appearance has not yet been scheduled as the legal proceedings move forward in the first-degree murder case.
