weldon mcdavid.is wife leo was home with her newborn baby when the phone rang. >> i answered the phone and it was wet and they told me to come out of the house with the baby. >> did you have any clue why they were there? >> no. >> they were there to look for evidence that weldon shot greg mulvihill. >> the most striking thing is he had guns everywhere. >> san diego county deputy attorney said they found a number of guns in the house but none was connected to the crime. then, hidden in the garage. >> they found the upper portion of an ar 15. >> noticed there was a suppressor or silencer attached to the weapon and a bag that catches shell casing so they don't fall to the gown -- ground. >> it had spent shell casings and that. the same number of shots of fire that night in carlsbad. >> you think you found the weapon. >> without a doubt. >> but lea had plenty of doubts. >> he has the skills to do that but he does not have the personality are hard to do that. >> police arrested weldon and at the station h

. >> weldon mcdavid, the man who said he just wanted to help. who once empowered a woman in an abusive marriage, now the fallen hero, contemplating life behind bars. perhaps he sums it up best. >> there is no winners here. no winners at all. this whole situation is a loss. >>> that's all for this edition of dateline. i am craig melvin. thank you for watching. you for ♪♪ >>> this sunday, presidential showdown. president biden and former president trump are set to face off in the first debate of the 2024 campaign. >> i'm not interested in playing politicians with our border and immigration. i'm interested in fixing it. >> when i'm re-elected, joe biden's illegal amnesty plan will be ripped up and thrown out on the very first day. >> will this high-stakes debate shake up the race? my guest this morning, biden campaign co-chair mitch landrieu and republican governor kristi noem of south dakota. >>> plus, running mates. donald trump narrows his choices for his vice presidential pick. >> there's never been a better politician, a better debater, a bett