Have you had (or heard of) a young seemingly healthy pet just drop dead?

I’m still in shock.

Last Monday (12–27-22) at 4:30 pm my 4 year old (very active and healthy) male cat was sitting on a table next to me. He suddenly fell off the table landing on his side and kicked his way across the room still on his side. I quickly went to him and he went completely limp. No pulse. No breathing. For the next 15 minutes I frantically pounded his chest alternating quickly raising an lowering his front legs where I could hear air entering and leaving his lungs.

He acted totally normal up until he dropped.

What do you think caused this sudden death? Heart attack, stroke, pulmonary embolism (EP).

He was out side in the snow (temperature around 20 degrees F) on and off all day. He looked like he was having fun walking an running in the snow. He even caught and killed Bushtit bird earlier that day. Perhaps he developed a clot from cold exposure that later caused a deadly EP?

What do you think?