William Singer, 81, and his 64-year-old wife Barbara were found brutally murdered in their north Phoenix home near 35th Avenue and Bell Road on July 2, 2014. Neighbors and the couple’s family described them as well respected and active in the community; William had been a Marine helicopter pilot and EMT instructor, and Barbara was a nurse practitioner. Police have characterized the scene as among the most violent they had seen.

Investigators believe the killings followed a home invasion. There were no signs of forced entry, so police say the couple may have known their killer or been coerced into letting a visitor inside. Surveillance footage from the night of June 28, 2014 shows both William and Barbara making separate, large cash withdrawals at an ATM; William appears to be under duress in that video, and police suspect the withdrawals were made under coercion and that the victims were taken back to their home and killed shortly after. Initial persons of interest were later cleared, no arrests have been announced, and the case remains unsolved.

Did anyone in the neighborhood recall unusual visitors or anyone asking about the Singers in late June 2014?