she's the church organist down at redeemer lutheran. ♪ he's the lead singer and guitarist of a locallues band messing with destiny. you'll get the irony of that later. together the couple, former college sweethearts, are raising four kids in that small house. six people, three small bedrooms, one bath. tight quarters for what looks like a tight family. did you get any sense of what their relationship was like? >> as far as i knew, mark's wife was great. >> reporter: charles alexander is mark's close buddy and the drummer in the band. >> he was always happy with the kids, he was always happy with his wife. he loved them. he loved his family. and it was just a great family. >> reporter: well, things aren't great for everyone. see, diane isn't just praying in church. she's paying the bills at home. okay, mark picks up an occasional shift bartending. but diane, a nurse is the breadwinner. >> she seemed to be stable and ended up supporting him. he was the house husband, stayed at home with the children. >> reporter: and if mark was a laid-back mr. mom, the actual lady of the house was civ

diane is a nurse and church organist at redeemer lutheran. she's the family breadwinner. mark, lead singer and guitarist of a local blues band. >> did you get any sense of what their relationship was like? >> as far as i knew, mark's wife was great. >> reporter: charles alexander is mark's close buddy and the drummer in the band. >> he loved them, he loved his family. it was a great family. >> reporter: it's a shock to friends and family when he dies suddenly in his sleep. >> i was devastated. i was devastated. >> did you have any inkling that anything was wrong? >> no. >> reporter: the medical examiner rules the death due to natural causes. diane moves her fourchildren into a new house, then months later, that coroner is back at her house again. this time for son sean. >> i said, we just saw the coroner's van was here. are you okay? is everything all right? and she said, oh, yeah. my son died. >> reporter: her neighbors say she's surprised by diane's response when offering condolences. >> was she distraught? >> no, she said it to me just like that. "my son died." very ma