QUICK! What kind of snake is this?

UPDATE: The snake has been identified by Eddie Sunila, Curator of Herpetology and Entomology, Houston Zoo. "… this is a non-venomous species and looks to be a plain bellied water snake." Thank you, Eddie and thank you Houston Zoo. AND thank you to all who posted on this thread.

Harmless plain bellied water snake.

Dead Snake!!

Not a sharp triangular head..........so....not poisonous.

Sophos3 :
It's just a rat snake, nonpoisonous. They're beneficial and shy. They eat mice et al.