My grandfather passed away at hospital, choked on food?

Hello doctor, earlier last week my grandfather passed away. It was unfortunate and even weird… the doctors had told us that he was suffering from ARDS. We were not convinced, especially after there was an episode of him falling and choking due to some food that got in his lungs. My grandfather was admitted to the hospital on December 15, 2016 and passed away on January 2, 2017. He had a stroke the day he was admitted, leading to the doctors figuring out that he had bleeding in the brain. His blood pressure was high and he was complaining about headaches. About 5-6 days later, his brain was starting to heal and his blood pressure had gotten better. He was doing way better. The only problem was that he was not eating properly. The doctors said that he was given a swallowing test and passed, they even gave him nausea medicine answered laxative, he was still not eating. Just 7 days after he was admitted, (a day or two after he was showing signs of recovery) he apparently choked on food and flat lined. The nurse found him on the floor, they don’t know how long… the doctors worked on him for 10 minutes and finally got a pulse back, reviving him. The doctors were not sure if he had a heart attack or a seizure and diagnosed him with Acute Respiratory Distress Syndrome. Note: my grandfather was a diabetic and had a few strokes beforehand (like months- to years ago). I need to know your thoughts and what you think he was really diagnosed with, I just can’t wrap my mind around the fact that they found him on the floor choking with an amount of minutes they didn’t even know.