(Eden Prairie, MN) -- Adrian Peterson is back in Minnesota following the funeral of his two-year-old son Wednesday in South Dakota. The boy died of severe head injuries in a Sioux Falls hospital. The Vikings All-Pro says he learned Tyrese was his son about two months ago, was planning on seeing him and was helping the boy's mother financially -- "and unfortunately this situation took place." The boyfriend of the child's mother is charged with assault and battery but more serious charges could be filed. Peterson says he doesn't expect to miss any more time with the Vikings as that criminal case moves forward.