Cousin's death ruled suspicious how can I get copy of death certificate if I'm no timmediate family?

I tried vital statistics department in my state and they stated that they could not release it to me. Myself and my mother are my cousin's only living blood relatives. My cousin's spouse is living, however we think that, that person is the reason the cause of death was ruled suspicious. The death was in 1999 and was caused by a firearm.

Cousin's death ruled suspicious how can I get copy of death certificate if I'm no timmediate family?
Get a lawyer, take it to court.

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