CLEARWATER, Fla. — Family, friends and law enforcement are still searching for answers in the murders of an elderly Clearwater couple. Mina and David Swan's family are increasing the reward for any information that will lead to the killer's arrest.

The reward was initially $25,000 until Crime Stoppers added an additional $3,000 in October. Now, the family has upped it to $50,000.

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Today marks six months since the couple was murdered in Clearwater on September 29. The couple was found shot to death inside their Flushing Avenue home.

The Swan Family

No arrests have been made. Clearwater detectives say they need more tips to lead them to the person(s) responsible.

Clearwater Police Chief Daniel Slaughter has said someone targeted the couple. Chief Slaughter ruled out any home break-in, robbery or similar crime. The house was well organized when police arrived to investigate.

The Pinellas County School District tells ABC Action News 80-year-old Mina Swan worked as an art teacher at Clearwater High School from 1983 to 1999. Her husband, 88-year-old David, was a retired certified public accountant. Neighbors say the Swans were not the type to have enemies and they can’t think of a single motive.

"They were the youngest 80-somethings on the planet," Helen Scott, who lived next to the Swans for decades, recalled.

“My mom loved her students, even those who couldn’t pick up a pencil," Mina's daughter Noel Devine explained previously. "She believed in them and their talents, even if they had never been in an art class before."

Devine said her mom and step-dad loved to travel. They hiked the Appalachian Trail in their 70s, visited Alaska and Iceland and had an upcoming trip to Norway planned.

"My mom even rode roller coasters with her grandkids into her 70s; even I don't do that!"

Clearwater PD put up four digital billboards between Pinellas and Hillsborough counties hoping a tip will help them close the case.

If anyone has any information about the case call 727-562-4141.