MANKATO — A man arrested in a weekend assault that severely injured a former Minnesota State, Mankato, football player is expected to be charged.

Police arrested the 21-year-old man Monday, hours after they released surveillance video showing him running from the scene in downtown Mankato. Formal charges are expected Wednesday.

Former Minnesota quarterback Philip Nelson is already charged with two counts of felony assault. A criminal complaint says Nelson kicked 24-year-old Isaac Dallas Kolstad in the head after the other man punched Kolstad, knocking him to the ground.

Nelson’s attorney has said his client was not the aggressor and that it’s not clear who caused Kolstad’s injuries.

Kolstad’s family said on its CaringBridge website that a surgery Kolstad had on Tuesday morning went well. He was still in critical condition.