The man is in custody after turning himself in to the Lake County Sheriff's Office late Wednesday.
Britney Meux, 25, a mother of a five-month-old daughter, was struck and killed while jogging with fellow corrections officers Tuesday evening. Meux worked as a corrections officer for three years.
A driver in a dark blue SUV slammed into Meux and three colleagues as they were jogging by the Lake County government complex in Crown Point. The other three officers, Latasha Johnson, 34, Delano Scaife, 22 and David Murchek, 26. were injured.
Scaife was airlifted to an Indianapolis hospital, where he remains in critical condition. Murchek, 26, son of the deputy chief of police, is home recovering. And Johnson was released from the hospital late Thursday afternoon. She is still in shock over what happened.
"I was thinking, Oh my God, what just happened, did this really just happen?" Johnson told ABC7. "We were barely into the run. It wasn't even five minutes into the run. Then we all just simultaneously got hit from the back," said Johnson, who had to have two rods put in her arm.
Meux and Johnson were extremely close.
"She was not just my coworker, she was a very close friend of mine, she was like a sister to me, a little sister, so I am very torn up about that," said Johnson.
The man's vehicle was impounded. Prosecutors are expected to file charges sometime Friday. The Times of Northwest Indiana reported the man has a previous drunken driving conviction.
A media briefing was expected sometime Friday.