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But the most important break comes from an unlikely source -- a piece of pizza. >> it just so happens that the fire never really hit that slice of pizza. that is what broke this case. >> for dna experts like lawrence kobilinsky, it's a pot of gold. >> you have a lot of cheek cells that tend to slough off into your saliva. there's a lot of dna in saliva. every time you bite into something, you are leaving small amounts of saliva behind. >> the pizza is taken to a forensic lab and immediately tested for dna. >> they compared that developed dna to a database, and out pops darrell wint. >> police ...

A piece of pizza. >> it just so happens that the fire never really hit that slice of pizza. that is what broke this case. >> for dna experts like lawrence kobilinsky, it's a pot of gold. >> you have a lot of cheek cells that tend to slough off into your saliva. there's a lot of dna in saliva. every time you bite into something, you are leaving small amounts of saliva behind. >> the pizza is taken to a forensic lab and immediately tested for dna. >> they compare that developed dna to a database, and out pops darrell wint. >> police have their suspect. a 34-year-old maryland man who worked for s...

Something, you are leaving small amounts of saliva behind. >> the pizza is taken to a forensic lab and immediately tested for dna. >> they compared that developed dna to a database, and out pops darrell wint. >> police have their suspect. a 44-year-old maryland man who worked for savopoulos at american iron works 10 years before. almost a week after the homicides, his face is everywhere. >> you need to stop what you're doing and look closely. >> the manhunt is on. >> the suspect is 34 darren dillon wint. >> he's a very violent man and the violence probably started when he was very young. >> he...

Emerges. police release grainy surveillance video that shows someone running from the burning porsche. could this be the killer? but the most important break comes from an unlikely source -- a piece of pizza. >> it just so happens that the fire never really hit that slice of pizza. that is what broke this case. >> for dna experts like lawrence kobilinsky, it's a pot of gold. >> you have a lot of cheek cells that tend to slough off into your saliva. there's a lot of dna in saliva. every time you bite into something, you are leaving small amounts of saliva behind. >> the pizza is taken to a fore...

Amounts of saliva behind. >> the pizza is taken to a forensic lab and immediately tested for dna. >> they compared that developed dna to a database, and out pops darrell wint. >> he worked for savopoulos ten years before. almost a week after the homicides, his face is everywhere. >> you need to stop what you're doing and look closely. >> the manhunt is on. >> the suspect is 34 darren dillon wint. >> he's a very violent man and the violence probably started when he was very young. >> he was born in guyana, for a short time was a u.s. marine recruit before dropping out of the basic training. win...