Snake has been several times on the verge of death, but never actually killed (except once in a THOH episode but those don't count). I recall in "Separate Vocations", Snake tries to run over Bart but the alley he's in is so narrow the car is stopped by the walls and he's sent flying through the glass. Also, in "My Sister, My Sitter", he's in line to see Dr. Nick and he has a really bad bleeding wound in his stomach.
I don't recall Snake dying in the electric chair in a non-THOH episode. Although, in "This Little Wiggy" Mayor Quimby almost died after several seconds in the electric chair.
There's also some random convict in "Hurricane Neddy" that was going to be killed in the chair, but the hurricane takes him away, only to be electrocuted to death by an electric pylon.