Reporting from, ahem, “elsewhere”, identifies the man and states he was arrested.

https://nypost.com/2024/03/08/us-news/heckler-who-shouted-at-biden-during-state-of-the-union-identified-as-gold-star-father/

"Abbey Gate!” Steve Nikoui yelled down at the president. “Second Battalion, First Marines!”

Capitol Police escorted Nikoui, 51, out of the chamber around 10:15 p.m. and took him into custody.

He was charged with crowding, obstructing, or incommoding Congress, a misdemeanor that typically results in the offender’s release after paying a $50 fine.

Nikoui’s son, Lance Cpl. Kareem Nikoui, was killed by a suicide bomber outside Kabul’s international airport while trying to process evacuees from the Biden administration’s botched Afghanistan withdrawal in August 2021."