My son called me last night about 9:30 my time and said Dad

WTF do I do?

? Well what is the problem, YIKES! On his patio right outside the door!
Ultimately the monster was killed but he was a few inches under 6' long! Seems to be a Banded Water Snake, not venomous but scary as hell and looks a hell of a lot like a water moccasin/cotton mouth which usually do not get much more than 3 to 3-1/2 feet long.