I have a good reason to think that Luke died as a martyr partially because of the continuous persecution and pursuit of Christians by the Roman Empire.
The good reason being, the fact that because of his close companionship with Paul he had received the same fate, but I just want to know more about the consensus (if there is one) and what the truth is because there seems to be other accounts.
Although, I found out while searching for answers on Google on how some actually saying he just died of old age and claiming a location in Greece which is not=fully confirmed.