This broadcast first aired on Dec. 9, 2006. It was updated on July 10, 2008.
On the evening of Sept. 28, 2000, former Indiana state trooper David Camm came home to find his 35-year-old wife Kim and his five-year-old daughter Jill murdered, both shot execution-style in the head; his seven-year old-son Brad died after being shot in the chest.
Just three days later, Camm, 36, was arrested and charged with the murders. Camm has adamantly denied any involvement in the murders.
Correspondent Richard Schlesinger has spent years investigating the case, one with bizarre evidence and many unusual twists that would lead to an ending that no one expected.
David Camm spoke to 48 Hours shortly after his 2000 arrest, recalling what he saw when he drove up to the garage of his home.
"I started to pull my truck in, I get up to the threshold and that's when I saw the first stream of blood," Camm told Schlesinger. "I get down in her face and yell 'Kim, Kim!' And her eyes - I could tell she was gone."
His children, Brad and Jill, were still inside the family SUV. "I looked in the back and I looked to the right, that's when I saw Brad, kind of like he was stretched over the seat and his little eyes-I could just barely see his little eyes," Camm recalled. "I could see little Jill, she was still sittin' there in her seat and her head, her little head was down in her lap."
Up until four months before the murders, Camm had been a trooper with the Indiana State Police and a lot of people were stunned when he was charged with the murders.
It's basic police work to look at the surviving spouse as the number one suspect, but to those who knew Camm, it seemed like a rush to judgment. He is from a large and influential family and had no obvious motive. And there was one other thing: he had what appeared to be an airtight alibi.
"David was at the gym at the time his family was killed. He was at the Georgetown Community Church playing basketball," says Camm's uncle Sam Lockhart, who from day one has insisted his nephew did not do it.
Lockhart says he was at the same gym at the same time, watching his nephew play. Ten other people say they can prove it too; they say they were all at the basketball game that night with Camm.
All of the men said they saw Camm at the gym and that he sat out the second game that night at approximately 7:30, around the same time police believe the murders occurred. Several players said they remembered seeing Camm on the sidelines. Another man at the gym that night also says he spoke with Camm.
If Camm snuck out of a basketball game at the gym, raced home, killed his family and raced back there without anyone noticing, he's either very clever or very lucky. Did he have time to do it? To find out, 48 Hours drove the exact same route prosecutors believe Camm took that night.
It took all of 15 minutes, investigators say, for Camm to commit the crime. It took Schlesinger eight minutes to make the round trip which means, if you believe the prosecution's theory, Camm had roughly seven minutes to kill Kim, Brad and Jill.
But to this day, investigators are still not sure what happened inside the garage that night. There are all sorts of strange things about the crime scene. For one, it seemed much too clean. And on top of the Ford Bronco, Kim's shoes had been neatly positioned.
So was the murderer tidy? A little compulsive? And there was more: an unidentified palm print on the Bronco door and a grey sweatshirt tucked neatly next to Brad's body.