Adrian Peterson's 2-year-old son is currently in critical condition in a South Dakota hospital ... after he was allegedly severely beaten by the man dating the mother of his child, TMZ has learned.
INFO AND UPDATES FROM MyFox9.com: http://www.myfoxtwincities.com/story/23666208/adrian-peterson-dealing-with-family-medical-issue-that-will-likely-be-police-matter
The Minnesota Vikings running back immediately left his team to be with his son.
Officials tell us they've arrested the suspect, 27-year-old Joseph Patterson ... who's been charged with aggravated felony assault and battery of an infant.
According to law enforcement, emergency responders arrived to the apartment where Peterson's son was living at 5:46 PM on Wednesday ... and found the child unresponsive.
He was rushed to a nearby hospital and medical experts determined the injuries were consistent with abuse.
Law enforcement sources tell us ... the child suffered severe head injuries.
Peterson is tight with his son -- back in February, we got video of the two hanging out together during NBA All-Star weekend in Houston.
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