Here are some sentences.
He is deceased but his sister is still alive.
Is that actor alive or deceased?
You only capitalize 'deceased' if it is at the start of a sentence.
My father is deceased.
The movie was played by someone who is currently deceased.
Although Elvis has been deceased for many years, his music is still very popular.
Example: As the rich deceased boxer's casket was carried to his grave, many people thought about his legacy.
The word dead and the word deceased can mean the same thing and so they are synonyms.
The pathologist performed an autopsy on the deceased.
No, an executor does not have the power of attorney to make decisions on behalf of the deceased individual. The executor's role is to carry out the instructions in the deceased person's will and manage their estate, but they do not have the authority to make decisions on the deceased person's behalf.
The eulogy of the deceased was kind and appropriate.
The deceased was interred at Forest Lawn Cemetary.
Assuaged is a past-tense verb that means to make something less intense. A sentence would be "The letter from her deceased husband assuaged her grief very little."
The deceased governor was buried in an ornate wooden casket.