>> coming up -- >> he was pretty confident that it was not a suicide and that this was a murder. >> the death of meg purk, a decades old case, and a bold new strategy to solve it. >> he looks at me a can just tell that all the color in his face has dreamed right out. he just looked like he had just been a ghost. >> when "dateline" continues. so-pretty stuff going on inside. it's true, with diabetic retinopathy, excess sugar can damage blood vessels, causing vision loss or even blindness. so remember this: now is the time to get your eyes checked. eye care is important to your long-term diabetes management. see a path forward with actions and treatments that may help your eyes— and protect against vision loss. visit noweyesee.com and take control of your sight.