A Northwest Houston home was the scene of a brutal crime in 1990. It was an August night when Tamara and Wistong Potes were awakened by an intruder.

Tamara was raped and then shot in the back of the head. She survived. Her husband, who was also shot, wasn't so lucky. He passed away.

21 years later, 48 year old Andre Sloan has been fingered as the suspect by the Harris County Sheriff's Office Cold Case Squad.

Dr. Roger Kahn, of the Harris County Institute of Forensic Sciences, says in 1990, the DNA technology was just starting to take shape. Fast forward 20 years, with the help of old evidence and a national database full of 7 million previously convicted offenders to compare samples with, cold cases are closer to being solved than ever before.

As for the suspect Sloan, he was matched in the database. Turns out he was already behind bars in Texas. He's currently serving a life sentence for a 1992 triple homicide in the Houston area.