Miami Dolphins RB Mark Walton just cut a sweet plea deal with prosecutors ... his gun, drugs and battery cases are all now closed -- and the dude won't have to spend a second more behind bars for any of his alleged crimes.
Walton was arrested three separate times in the past year -- once for marijuana possession, once for an alleged battery, and the third for leading cops on a wild police chase.
TMZ Sports obtained footage of the third arrest ... and you can see in the video, Walton was in BIG trouble with officers -- getting tased and still managing to flea the scene.