This list of facts assumes that the statements of the media, law enforcement, Katelyn Markham/John Carter's friends and family on Facebook, and John Carter in media interviews are all accurate. It also includes a few logical deductions (if A, then B) proceeding from these statements. Abbreviations should be self-evident. Let me know of any additions or corrections.
Information
-KM was 21 years old at the time of her disappearance on August 13 or 14, 2011.
-KM had been engaged to her fiance JC for a year and they'd been dating for 6 years. JC's step-sister Megs has known her for 8 years and introduced them shortly after she first hung out with KM. JC said that they were a couple from that time forward. (Not clear on 6 versus 8 years issue.)
-The couple had plans to move to Colorado in a few months, and to marry eventually, after JC turned 25, but not imminently.
-They were moving to Colorado "with some friends" per Megs on FB. The move to Colorado was KM's idea, according to JC.
-JC lives with his mother and stepfather, 0.2 miles from KM's townhome. Her home is en route to his workplace.
-KM attends the Art Institute of Cincinnati, works a co-op job at the school store, has an internship, and has another job at David's Bridal in Tri-County Mall.
-KM was adopted and does not have a good relationship with her mother (per friends' comments and her online journal entries), or, she has a very close relationship with BOTH her parents (per 8/18/2011 JC radio interview).
-KM shares a townhouse with her adoptive father David Markham but effectively lives alone, because he had all but moved in with his girlfriend by the time of her disappearance.
-KM was supposed to move in with JC and his family in 2 weeks. (Per the KM FB group. This statement was not seen by me, but reported by others here at WebSleuth.)
-KM has a small dog who is usually closed in the bathroom when she isn't home, and had a bed, food, and water there.
Pre-Disappearance
-Friends of KM's saw her with JC at the Sacred Heart church festival on Friday night, August 12. It is uncertain if anyone saw her at any point on Saturday besides JC.
-A cousin of JC, Gabrielle K, asserted on FB on 8-26 that "other people" did see KM on Saturday (though she adds she doesn't know who). GK also says that KM posted a birthday greeting on GK's FB Wall at 1pm "that day," presumably Saturday the 13th because that was the day people were inquiring about. (This could be verified by someone who is FB friends with GK...)
-Quoting DimeDetective: "Sacred Heart Church Festival was going on approximately 0.4 miles from KM’s townhouse the weekend of her disappearance (6 p.m.-midnight Friday 8/12, 5:30 p.m.-midnight Saturday 8/13, 3 p.m.-9 p.m. Sunday 8/14)."
-David Markham spent the night with his girlfriend (with whom he'd mostly moved in) on Saturday, August 13th. This seems to be the norm since JC characterized KM as someone who "stays in a house by herself" in his 911 call.
Saturday, August 13
-KM and JC had plans to meet with his parents on Saturday to discuss the Colorado move, but they cancelled because KM was too tired.
-KM and JC had a "totally normal night" with no arguments and no odd moods or behavior on her part.
-JC left her apartment at 12 midnight Saturday (per his 911 call), or between 11 and 11:30 (in all his subsequent interviews including Nancy Grace).
-JC says KM was tired and getting ready for bed when he left. "She was going to bed. She wasn't going out to do anything, so she would've been in her bed." (quote from his 911 call)
-JC did a lot of errands for KM because she was so busy, and she had requested that JC burn some old bills and other papers of hers (too many to just tear into pieces, as he told Nancy Grace). He did so in a friend's firepit that night after leaving her house.
-KM's current paperwork, bills, etc. are still at her apartment. JC only burned old papers. KM was guided in this action by JC's mother who had recommended how long to keep various papers based on a magazine article.
-JC's mother said JC and KM often have friends over for fires, and don't own a shredder, so they thought that was the best way to get rid of papers.
-KM and JC texted back and forth regarding the paper-burning while it was going on, and she said she wished she could have been there for it, adding "but that's okay." He told her she could be there when he burned some of his papers.
-It was raining that night in Fairfield beginning around 11 pm, with an actual storm coming through at 11:30, around the time JC left her apartment and began the paper-burning. It was clear by 1 am.
-JC received KM's last text at 12:52 am. It was a picture message, a photo of a photo of KM, taken by her boss at her internship.
-According to law enforcement, the phone's GPS and the phone itself were turned off sometime around 12:45 am Sunday.
-In spite of what some have asserted, including Nancy Grace, it's entirely possible for picture texts to take several minutes and sometimes even hours to arrive after they're sent.
-JC sent KM a "good morning" text before he went to sleep that night. (per 8/18/2011 JC radio interview)
Sunday, August 14 (Phase I)
-JC did not receive an answer to his customary good morning text, but wasn't overly concerned & assumed KM was running late for work or was busy.
-David's Bridal at Tri-County Mall is 7 miles from KM's home, opens at 12 noon on Sundays and closes at 6 pm.
-JC texted her throughout the day on Sunday, and also tried calling. Becoming concerned at the lack of response, he got permission from his manager at Papa John's to leave work and check on KM.
-JC's workplace is anywhere from 2.2 to 4.3 miles from KM's home, assuming he works at one of the 3 closest Papa John's locations.
-He arrived at her home around 7 or 7:30 pm Sunday evening.
-The timeline suggests he did not call her workplace or contact her co-workers during her work shift on Sunday. If he'd called David's Bridal (which closes at 6) or one of KM's co-workers, he would have learned she didn't show up for work at all, and he would have been alarmed about her well-being sooner than 7 or 7:30.
-He was "worried"/he "had a feeling something was going on"/he "freaked out"/he "panicked" (his words from different interviews) the moment he saw her car parked at home, and the reason he always gives for his fear is that she and her car were supposed to be at work. This is, in itself, another indicator he didn't call her workplace. If he'd called, he would have known she hadn't gone to work before he drove up and saw her car.
-Contradicting himself, however, in one interview he said he expected her to be getting home from work around 7 or 7:30 Sunday evening. (Not clear how he can expect her home from work, and panic because she's not at work, at the same moment.)
Sunday, August 14 (Phase II)
-JC "ran" into her apartment, using his key, and did not notice whether the door was locked. She was gone.
-Nothing else was missing except her red Blackberry cell phone. Her keys and purse were also in the apartment.
-KM's engagement ring, which she was presumably wearing, is also missing. The ring is a zigzag of nine small marquis-cut diamonds set in yellow gold.
-KM doesn't make her bed normally so there was no way to tell if she had slept in it.
-There were no signs of forced entry, a struggle, or anything else unusual, except that her dog was shut in her bedroom, instead of the bathroom which would have been KM's usual habit.
-The dog had relieved itself in the bedroom, so it was evident to JC that KM had been gone for some time.
-At this point JC "freaked out" and "immediately called friends, family, police."
-His call to 911 was made around 8 pm.
-In the 911 call, he mentions KM's purse being in the apartment, so he had to have been inside already. But when the dispatcher asked if he was at the apartment, he said, "I'm heading there now." If we take him at his word, he must have found her missing, left, gone somewhere, and called 911 while on his way back to the apartment.
-JC says KM's father was with him when he went into the apartment. (The first or second time, or both? This is not clear. Did he perhaps leave to pick him up before calling 911?)
-In the 911 call, JC tells the dispatcher that he has been with KM for 6 years and that she's "not deceiving"; also that there were some "questionable people" attending the Sacred Heart festival nearby.
-JC said he and KM have attended the Sacred Heart festival every year for the 6 years they've been dating. They also attended it Friday night, August 12, even though KM was tired and didn't really want to go. (8/18/2011 JC radio interview)
General
-Though previously a fairly regular poster on FB, JC's FB Wall shows no activity between July 27 and August 15 (when he began to talk about KM being missing).
-August 16, 2011 was Katelyn's 22nd birthday and the one year anniversary of her engagement. JC and friends threw a party for her in absentia.
-KM's friend Ashley G. and JC's sister Megs say KC had a stalker, someone who was "obsessed" with her. JC has said more than once there is no such stalker.
-In his August 18 radio interview, JC said he didn't have a lawyer because he didn't do anything wrong. It's unclear whether this is still true 10 days later.
-JC told Nancy Grace he took and passed a polygraph the 2nd day after KM went missing. This was the first mention of it in the media, though he gave multiple other interviews after the date of the polygraph.
-It is uncertain how many polygraphs he took, how many he passed or failed, or who administered them, whether law enforcement or private agency.
-On August 27 in a radio interview, Fairfield's Chief of Police Mike Dickey refused to confirm or deny whether JC has in fact taken a polygraph test.
-In interviews, JC sometimes speaks of KM in the past tense, and sometimes does not.
-There is no evidence of past domestic violence between JC and KM.
-Experts on Nancy Grace's TV show says JC does not fit the psychological profile of someone who would harm her.
-The largest search in the history of Fairfield law enforcement has turned up no trace of KM.
-There is no evidence of foul play or a struggle in her home, JC's home, or their vehicles.
-There has been no activity on KM's cellphone, bank account, or credit cards since she disappeared.