that's kinda strange, you know. >> was he a mama's boy? >> well, i mean, i guess he was a mama's boy, you know. anything he needed, he got. >> reporter: but according to michael, becky's over-the-top generosity always seemed to come with strings attached. >> it was that, "hey, i'm going to need something from you. here's the keys to your new car." "hey, i'm going to need something from you. here's your house." "hey, i'm going to need something from you. here's an envelope full of money." >> reporter: and whatever becky asked for, chris would eagerly deliver. >> he said, "it may be very hard for you to understand, but i would do anything in this world for my -- for our mother." >> reporter: could "anything" have included killing his mother's romantic rival? michelle amerson, who knew the family well, says over the last several years chris had grown distant. she worried he was heading down a dark path. >> he had changed a lot. so we were -- we weren't around him a lot. >> when you say, "he changed a lot," michelle, what are you