(KFYI News) – Phoenix police are asking for the public's help in solving the murders of a couple in their north Phoenix home last week. 

William Singer, 81, and his wife Barbara, 64, were found dead after a home health care worker called police requesting a welfare check when the couple failed to answer the door.  Police forced their way into the home and found the couple in what was described as "a violent scene," although they haven't released how the couple died.

Detectives say they have no suspects and no motive in the killings, and there was no sign of forced entry.

William Singer's son Bill, who lives in Indiana, talked to reporters on Wednesday.  He said his dad and stepmom were "as close as two people can be."  William was a Marine helicopter pilot in the Korean war, then returned to civilian life as a traffic helicopter pilot for Chicago's WGN Radio.

Later, William taught lifesaving techniques to firefighters and EMTs.  "That was his passion," his son Bill said, "was being able to help others save lives and be of service to other people."

Barbara was a nurse.  Bill says they loved helping other people, and he's never seen two people more in love.  "The only saving grace about all of this is that they will never ever have to know what it's like to live without the other," Bill said, choking back tears.

If you have any information that might help solve the murders, call Silent Witness at 480-WITNESS  (480 - 948-6377) .

PHOTO: William Singer talks to reporters at Phoenix police headquarters, with his wife Melissa by his side.