karen lofton turned out to be a devoted mother and nurse with no apparent enemies. she was divorced from karissa's father, kirkland, who now lived in atlanta. the daughter, karissa, was in private school. good grades and still very attached to her father. >> karissa was always a special girl for me because at a young age, she had open-heart surgery. and she bounced right back from it. >> reporter: kirkland says he had watched karissa blossom into a gregarious teenager, a fashionista and aspiring model with a knack for selfies. >> i sing this song by bob carlysle called "buttely kisses." it told the story of him and a daughter. and i used to sing that song to her. and she would just look up at me and she loved me singing that song to her. she was my butterfly, that's what i called her. >> reporter: now kirkland's butterfly was dead, and county's finest to help him solve the case, including detective anthony schartner. >> this is a mother, hard-working, and her daughter. you know, both think that they're safely inside their home. >> and here comes the guy out of >> ye

lofton. >> sweetie, slow down. what's the address? >> reporter: police rushed to the scene, but it was too late. they found karissa and her mom, karen in their bedrooms. each killed execution-style with a shot straight to the head. >> crimes quickly become statistics. but this just stands out, doesn't it? >> it stands out. it makes the hair on the back of your neck stand up, also. >> reporter: veteran prince george's county homicide detective bernie nelson was in charge of the case. the first arriving officers told him they'd found the main door locked shut from the i driveway. nothing appeared disturbed. >> reporter: investigators didn't find any useful forensic evidence. just six spent shell casings from the bullets that had killed karen and karissa, fired from a ♪ hi. ♪ ♪ i don't think that's how they're made. klondike hooks up with tasty flavors... the best ice cream bars ever conceived. liquid foundation - l'oreal's new lumi cushion. a cushion drenched in liquid foundation. tap on a little for a fresh luminous glow... tap on more whenever you need more coverage. new lumi cushion from l'oreal makeup designer paris. most people k