College Football Player Mekhi Nelson Arrested After Alleged Altercation With Pregnant GF

Nebraska Cornhuskers running back Mekhi Nelson was arrested in Florida after an alleged altercation with his pregnant girlfriend ... TMZ Sports has learned.

The redshirt sophomore was taken into custody around noon at the Blue Flamingo Resort Key West and transported to a nearby jail and booked for misdemeanor battery.

According to the police report, officers responded to a call for a disturbance at 11:39 AM. Once they got to Nelson's room, cops say he answered the door and stated he was in an argument with the mother of his children.

In the docs, Nelson claimed the two were bickering over how another man -- who also fathered a child with his girlfriend -- was speaking to her ... and told cops he had anger problems that "seemed to flare up" when he addressed how the other guy was acting.

The woman told officers a completely different story -- she said Nelson grew increasingly frustrated over how long it was taking her to get ready to enjoy their vacation ... and an argument ensued.

She said she eventually locked Nelson out of the room ... but allowed him back in after he pounded on the door, as she did not want to have any issues with their stay at the resort.

Once Nelson was back inside, the woman claimed he was even more angry ... and when she tried to call her mother, he took her phone and threw it across the room. She claimed he then ripped the top and bottoms of her bathing suit off her body, scratching her stomach in the process. She also had a scratch on her thigh.

The woman stated this is not the first time police have been involved in an incident between them ... but noted she is currently seven months pregnant with their second child together.

In the report, cops say Nelson cried on his way to jail ... making statements that he was "just like his father," who was incarcerated when he was a kid.

We obtained Nelson's mug shot ... and the 6'0", 195-pound athlete gave an intense stare as he looked into the camera.

Nelson is entering his third year with the program ... and is expected to compete for a starting job with Jamal Rule and Isaiah Mozee.

He had 27 carries for 147 yards and two touchdowns on the ground in 2025 -- including a 38-yard score against Utah in the Las Vegas Bowl. Nelson also caught eight passes for 102 yards.

According to his Nebraska bio, Nelson was an Academic All-Big Ten and Tom Osborne Citizenship Team recipient last season.

Prior to college, Nelson starred at Wilkes-Barre High School in Pennsylvania and St Thomas More in Connecticut.