According to an arrest affidavit, Smith, an NFL draft prospect, suffered severe burns on his head, neck, back, a shoulder and an arm.
Mary Gaspar has been charged with felony aggravated battery. She is five months pregnant with their child.
According to the arrest affidavit, Gaspar gave this account at Florida International University police headquarters:
Gaspar and Smith argued through the day on Oct. 31 about how much attention Smith was paying her and their relationship. While in Smith's dorm room and "feeling extremely emotional and stressed," Gaspar told police, she boiled a pot of water. Then she walked over to Smith and poured it on him.
When Smith didn't react strongly enough for her, she started hitting him with her open hands, she told police.
Gaspar was arrested two days later.
The extent of the burns aren't known, but Smith has been seen back on campus even though he's not fit for the football field.
Smith, a four-year starter, ends his career with 175 receptions for 1,936 yards and 17 touchdown catches. He made the midseason John Mackey Award (best college tight end) watch list in 2014 and 2015 and the preseason Mackey Award watch list in 2015 and 2016.
Gaspar's attorney declined to comment when contacted by The Associated Press.
Information from The Associated Press was included in this report.