. >> not long after, marion county sheriff jason sandholt arrived at the farm house.grew up in marion county and knew the carter family. did you get into the house itself? >> i did. >> and there you are in the kitchen, saying what in the world happened here? >> correct, and who would have a motive, who would have, i mean, the desire to kill a lady in rural iowa? >> the sheriff called for help. >> got multiple phone calls from my boss. >> special agent mark ludwig works for a division of the state police, the department of criminal investigation, the dci. this was his first case in pleasantville, about an hour from des moines. >> so, i get here to the driveway, got multiple vehicles in the driveway. law enforcement's on the scene and the family's kind of gathering around the big tree. >> does any of the arriving officers tell you, that's the husband or that's the son? >> i meet with the sheriff, and it's apparent to me that these are family members. >> yeah. >> and i don't know names yet. >> as soon as he got a search warrant, agent ludwig entered the house with crime