once again, here is andrea cannon. >> my friend has just been shot. >> greg had been shot and barelyd. someone had lured him to the scene of the crime with a call from a burner phone. now police gathered around sergeant derby's computer screen to see security camera images of the person who bought the burner. >> who was it? >> it was diana lovejoy. >> diana lovejoy, greg's soon to be ex-wife. >> is this a smoking gun getting this photo i diana lovejoy? >> it definite points us in that direction. >> they searched for more evidence in diana's home. >> we were able to locate the clothing she was wearing when she purchased the phone. >> police had enough to arrest diana and bring her in for questioning. at first, she denied any involvement in the shooting. >> what is her alibi? >> that she was at home all night long. she never went out. >> and police realized she might be telling the truth about that. just because she bought the trac phone doesn't mean she was at the crime scene. >> because diana was most likely not the person lying in the grass in camouflage with a rifle. >> fair to say

with the conclusion of our story, here's andrea cannon. >>> they all had big plans.etting married. his younger brother, alex, was planning to go to college, and laura and p.j. were preparing for a fresh start in north carolina. but instead, in the summer of 2017, they were all going to court to stand trial for second degree murder. and in a highly unusual ruling, the judge decided all four would be tried together. four trials this one. >> it's just bizarre. >> yeah. >> that this family would be on trial together. >> i don't think i've ever seen anything like that. >> each had his or her own attorney that sat down with us. collin's attorney. >> there was no motive. >> alex's attorney. >> a lack of evidence case. >> p.j. tucci's attorney. >> no proof whatsoever. >> and two attorneys for laura. >> it was a circumstantial case. >> they were all prepared to argue that the prosecution had no idea what really happened in that basement. does anyone know who is real killer is? >> the real killer knows. it could have been one of many people. >> this is a classic who done it. >