this is just one of several cases investigator patty roland will handle over the course of today's 12-hour shift. >> hi, bill. >> okay. see you later. have a good day. >> thank you. you mean you hope i have a quiet day? >> patty's not even out of the parking lot when the death bell rings. her work issued cell phone. a 50 something-year-old man has died at home. he's a diabetic with high blood pressure and chronic back pain. the roseville, michigan police deny our cameras access. >> is the family inside? >> yes. >> a white male? >> yes. >> for close to an hour patty talks to police, examines the body, and takes inventory of all prescription drugs found at the scene. a nurse by training, with 15 years experience, it isn't difficult for her to form a hypothesis as to cause of death. >> initially this appeared to be a natural death but after some investigation, probably accidental overdose. i think he over medicated. >> they are kind of like police. they're investigators and they go to these scenes and collect the information that i need to make decisions about how a death investigation i

. >> patty roland is a three-year veteran of the m.e.'s office and a nurse by training. today that experience will serve her well. >> when we walked into the scene her husband was visibly upset. i mean, just distraught. i could sense that he was very uncomfortable and the officer on the scene told me that he had had chest pains prior to our arrival. are you having chest pains? >> not right now. >> were you? >> yeah. >> have you had a heart attack in the past? >> yeah. >> when did you have your bypass surgery? >> 2000. >> okay. you get that chest pain again you know you probably should call your doctor or go to the emergency room. you're dealing with a lot right now. how long were you married? >> 60 years. >> oh. i'm so sorry. obviously my concern was for him. i had plenty of time. i was going to do my job but i needed to focus on him at that time. okay. i'm going to take a look at her and then i'll come back and talk to you. okay? >> okay. i'll be right here. >> let us know if you start having that chest pain because we need to worry about you now. okay? because we can c

. >> medical investigator patty roland, who works with dr. spitz, responds as well. >> there is a female. i don't have the age. that was found by her children's nanny when she came for her scheduled visit. they found blood all over the place. >> the sheriff's department cordons off the potential crime scene. with so much blood, investigators can't rule out foul play. >> it looks like a suspicious death. we don't really know what happened. >> dr. spitz and his staff at the medical examiner's office are responsible for investigating all suspicious or unexplained deaths in macomb and st. clair counties, a collection of 66 suburban townships, cities and villages outside of detroit. >> we work with the police at the scene so that nothing is missed. and the police, while they do a good job at investigating, are not always comfortable dealing with a dead body. >> in a special arrangement, our cameras and producers are allowed unrestricted access to the 24-hour world of the medical examiner's office as its employees respond to death scenes. >> i'm ju