and then, detective tony geraldi got a call from the medical examiner.rter: what did the m.e. discover? >> the cause of death was blunt force trauma to the head coupled with drowning. >> in such a way that it could've happened accidentally, or did it seem to the m.e. as if it was homicide? >> with the m.e.'s -- physical findings that there was foul play. we were looking for somebody that caused this death. >> reporter: here's what the medical examiner said: one side of samira's skull was fractured. which certainly meant she could have hit her head on the way into the pool, but the other side of her head was damaged, too. a simple slip and fall couldn't account for that. but remember, the m.e. saw evidence of both blunt force trauma and drowning. which meant she was still alive when she hit the water. so was it murder? it looked like, yes. the detectives went to work. >> we collected as much physical evidencewe and we interviewed everybody that saw samira last or that was close to her. >> like the man who found her in the pool, the handyman, gerald gardne