. >> althea kennedy was sherri's boss at the hospital and had originally hired her. >> we couldn't believeirst of all, like how could someone do this? people crying. people upset. i mean, the hospital was like a tomb, you know? so, the loss was real palpable. >> sherri had just married three months earlier to john ruetten. >> where the happily married? >> unusually so. >> months after the wedding, john found sherri sprawled dead. he might seem a likely suspect, but john was cleared almost immediately. the lapd focused instead on evidence that this was a burglary that turned violent. >> this was no accident. >> yolanda mcclary was a retired crime scene investor investigator and was a consultant to "dateline. " >> multiple shots fired. shots fired at very close range. >> she has reviewed court records and media reports on this case. we returned with her to the actual apartment where sherri was found murdered to try to understand what happened. police think maybe the killer just walked in the open front door? >> they didn't find any forced entry, so, yes, they are assumg the front door was op