both forms were made out to dolores delgado. volver dolores bought match the caliber of gun that had killed karlyn. >> we saw it was one of the guns on the list. >> this purchase of a gun was not a smoking gun. the detectives had to wonder why dolores would lie about owning a weapon , and there was something else. he soon learned that dolores put a box of ammunition up for sale on facebook. >> can't say it's the same bullets but they match the characteristics. >> all of this sleuthing took months and while detectives were working, dolores moved to san antonio, texas, into an apartment not far from maliek kearney. 150 miles west on the farm in del rio, karlyn's mom knew nothing about this new person of interest despite staking on the detectives. >> it's me. i do not want you to forget my daughter. >> the investigation encompassed half a dozen states, but maryland detectives and fbi agents were honing in on dolores delgado. what were you learning about the relationship between maliek kearney and dolores delgado? >> just how weird i