Die is the verb in the present, and died is the verb in the past:
Dead is the adjective, so we often use it with the verb “to be,” or before a noun:
Informally, we can also use die/dead when an electronic device stops functioning, or when a phone or internet connection gets disconnected:
(the telephone connection got cut off)
5 hours 10 minutes ago
5 hours 11 minutes ago
1 month 2 weeks ago
4 weeks 2 days ago