PHOENIX - Almost four decades after 16-year-old Pauline 'Robin' Burgette was killed, her family is holding out hope that someone out there has information that could solve this cold case.

In 1978, Burgette was found dead at home with very few clues.

"It's time for that person to answer for what they've done,” said Chad Burgette, 38 years after the murder.

Chad says he remembers the moment he found his sister's body like it was yesterday, and the image haunts him.

"I live with it every single day,” he said.

Robin was only 16 when she died. Detectives called it a brutal killing, and they say a sexual assault may have also taken place.

But it’s not too late to solve this case.

"We have forensic evidence in this case,” said Det. Clark Schwartzkoph, the case agent for this cold case. “We're just looking for the right lead, the right path to take."

On March 12, 1978, around 5 p.m., 11-year-old Chad found his sister's body in her bedroom at an apartment on 26th Place near McDowell Road in Phoenix.

She had left a friend's house around 8 p.m. the day before to meet her then boyfriend. That's the last time she was seen alive.

Her brother has spent his whole life hoping for answers — now more than ever, and he needs the public's help.

Anyone with information on this case should call Silent Witness at 480-WITNESS. You can remain anonymous and qualify for up to a $1,000 reward for information that leads up to an arrest.