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He and his brother chris were from a prior marriage. and michael came with a history of trouble, mostly drugs. so, that's gotta make your nose twitch a little bit. >> most definitely. he's on the scene when we get there. he's had a lotta problems in the past with -- with -- with drugs. so that raised a lotta red flags. >> reporter: opportunity to get quick cash? >> most definitely. >> drug habit? make a buy? >> you know, they gotta get money. and the best way to do that is -- is burglaries, you know? get the quick cash. >> reporter: did you have trouble with drugs at the time? >> i won't say t...

Someone they had already met? here again is dennis murphy. >> reporter: investigators in grovetown, georgia now had a murder case on their hands. kay parsons had been assaulted and killed in a home invasion. and the house of her good friend becky next door had been ransacked too. is your door to door, your canvassing, coming up with anything? >> no. nobody -- nobody's seen anybody, you know, out of the ordinary in the neighborhood. >> reporter: so they turned to the first person in the neighborhood to notice something was wrong -- the contractor who'd alerted 911 -- first man on the scene. inv...

Lot more about michael. he was becky's oldest son. he and his brother chris were from a prior marriage. and michael came with a history of trouble, mostly drugs. so, that's gotta make your nose twitch a little bit. >> most definitely. he's on the scene when we get there. he's had a lot of problems in the past with drugs. so that raised a lot of red flags. >> reporter: opportunity to get quick cash? >> most definitely. >> drug habit? make a buy? >> you know, they gotta get money. and the best way to do that is burglaries, you know? get the quick cash. >> reporter: did you have trouble with drug...

>> but why would michael murder his mother's best friend? >> reporter: investigators in grovetown, georgia, now had a murder case on their hands. kay parsons had been assaulted and killed in a home invasion. and the house of her good friend becky next door had been ransacked too. is your door to door, your canvassing, coming up with anything? >> no. nobody -- nobody's seen anybody, you know, out of the ordinary in the neighborhood. >> reporter: so they turned to the first person in the neighborhood to notice something was wrong -- the contractor who'd alerted 911 -- first man on the scene. inv...

School shooting in u.s. history, 17 students and staff killed. >> if we can't protect our children in schools, then who can we protect? >> reporter: that state commission highlighting security failures including routinely unlocked doors and gates allowing cruz to get inside. >> that door was unlocked and unstaffed and, that, we say, that is a security failure. >> reporter: no p.a. system to warn staff and students seen here that day crammed into a hallway. inadequate outside video cameras, one of them capturing that school resource officer taking cover outside instead of confronting cruz. the ...