Dead is not a verb and does not have participle forms. The verb form is die, and the past participle is died.
the past participle for the word die is either died or dead
The past participle of die is died.
The past participle of the verb die is died.
The past participle of the verb die is died.
The past participle of die is died. Eg: My grandfather had died by the time I graduated.
died, died
call died dead
The past participle of "do" is "done." The past participle of "have" is "had."
The past participle of "am not" is "have not been."
The simple past and past participle are both died.
The past participle of "do" is "done."