but after cadaver dogs found the scent of human remains in chris' car, detective bryan wallace wasn'tt what happened the night she disappeared is total bull [ bleep ]. >> reporter: wallace pushed him for the truth. >> how did it happen? did she fall? she did. was she drunk as [ bleep ]? what happened? >> that's exactly it. we're struggling over the phone, only this time we're outside on the steps. and she lost her footing, and she fell and hit the step, and i heard the crack. >> he said they were struggling over a cell phone. she slipped, fell backwards and hit her head and died. >> reporter: did you believe this new story? >> no, no. no way. >> reporter: finally, chris admitted heather was dead but insisted it was only an accident. still, the most important evidence was missing -- heather's body. chris told detectives he dumped her at a gas station. police went there, found nothing and checked security cameras. >> they've got videos from the last 15 days. they have looked at everything from 10:00 a.m. till 4:00 a.m., and your car never even pulls on the lot. >> reporter: chris then c

but after cadaver dogs found the scent of human remains in chris' car, detective bryan wallace wasn'tory about what happened the night she disappeared is total bull [ bleep ] >> reporter: wallace pushed him for the truth. >> how did it happen? did she fall? she did. was she drunk as [ bleep ]? what happened? >> that's exactly it. we were struggling over the phone and only this time we were outside on the steps. and she lost her footing and she fell and hit the step, and i heard the crack. >> he said they were struggling over a cell phone. she slipped, fell backwards and hit her head and died. >> reporter: did you believe this new story? >> no, no. no way. >> reporter: finally, chris admitted heather was dead but insisted it was only an accident. still, the most important evidence was missing -- heather's body. chris told detectives he dumped her at a gas station. police went there, found nothing and checked security cameras. >> they've got videos from the last 15 days. they have looked at everything from 10:00 a.m. till 4:00 a.m., and your car never even pulls on the lot. >> reporter:

in an exclusive interview, trump tells chris wallace he's still considering other options. bryan is live outside trump tower with more. hi, bryan. >> reporter: good afternoon, shannon. the president-elect says stay tuned as to who he will pick as secretary of state. his team says we could expect an announcement as early as this upcoming week but all eyes are on who appears to be the leading candidate, rex tillerson, who mr. trump calls a world-class player and a dealmaker. in an interview with our chris wallace, mr. trump makes it clear he values tillerson's relationships with world leaders. exxonmobil operates in over 50 countries. it's made some $200 billion in the ten years he's been the ceo, and he may not have traditional diplomatic experience, but tillerson has brokered many international business deals with these world leaders, and that's what makes him an attractive candidate to mr. trump. the president-elect says he currently has one person in mind he thinks can do the job, but he hasn't quite made the final decision just yet. >> i have others also that i think -- i mean

bryan? >> reporter: president-elect trump tells our chris wallace that he's very close but has not yet settled on a decision on who will be ace secretary of state. the trump transition team says we won't expect an announcement until next week at the earliest. also, on top of that, the trump transition team confirms that trump met with exxonmobil's ceo, rex tillerson, today. that's the second meeting they have had. all eyes are on tillerson, thought to be under serious consideration for the secretary of state post. this is the second meeting the two men have had watt trump tower. he's been at exxonmobil since 12006. he has no diplomatic experience but he does offer to bring executive leadership experience to the role, if chosen. exxonmobil operates in more than 50 countries but that could raise red flags about conflicts of interest and tillerson has had extensive business dealings and is said to have a close relationship with vladimir putin. he was awarded the award of friendship by putin. senator john mccain, chairman of the senate committee on armed services, says he's concerned about tillers