According to police, officials are still determining the exact injuries that killed two-year-old Tyrese Ruffin.
"They may have an initial assessment, but it's not going to be official until they get all their tests done," Sioux Falls Police Public Information Officer Sam Clemens said.
When the final autopsy results are reviewed, the Lincoln County State's Attorney could bring more serious charges against 27-year-old Joseph Patterson, the man accused of beating the toddler.
"They were going to do an autopsy. I don't know exactly when that is taking place. We're probably looking at at least two weeks, if not a little longer by the time everything comes back with that autopsy results," Clemens said.
Authorities say Patterson was home alone with Tyrese when the boy was found unresponsive in a Sioux Falls apartment. The man currently faces aggravated battery on an infant and aggravated assault charges, which were filed before the boy died.
Patterson has been in trouble with law enforcement before. Last year, he pleaded guilty to domestic assault and violating a no-contact order. In that protection order, his ex-girlfriend, who is not Tyrese's mother, wrote that Patterson had threatened to kill her multiple times and had spanked her three-year-old son so hard that it caused welts.