. >> they zeroed in on this man, darren boswell johnson. >> they were childhood friends.y met in high school. they were in a relationship in high school, and they remained friends. >> investigators wondered, did that past relationship leave bad blood between ashanti and darren? >> not until as recently, where i would say harassment or harassing phone calls. promises made broken just to get past certain things. >> those certain things darren wanted to get past included an uncomfortable secret nesn inkling that he could be chloe's father, an idea darren didn't want to accept. >> my sister did two home dna tests and he tampered with both of them. he falsified them. i believe in having someone else take one. or pouring water on one or something of that nature. and that led to the court's dna test. >> two months before she and chloe were murdered, the court ordered paternity tests confirmed. ashanti's instinct darren was indeed chloe's dad, but why would the results of the paternity test alone drive him to murder? ashanti's family suspects the answer is the age old motive mone