Police Lt. Joe Carns said a 911 call came in at 10:57 p.m. Wednesday. A woman said her estranged husband had been arguing with her and she advised him to leave.
"She said he struck her in the face," Carns said.
The suspect, later identified as Astacio, had left his suburban house by the time officers arrived, but turned himself in about 4 p.m. Thursday. He was taken to the Arapahoe County Jail for booking and to arrange bond.
Officials said the case would be handled by the county attorney's office.
The Rockies had no formal statement on the situation.
Astacio is 12-9 with a 4.88 ERA and leads the team in victories. He ranks fourth in the NL with 149 strikeouts.
Astacio pitched the entire 1998 season in the Rockies rotation without missing an assignment, and set a personal best with 34 starts and topped 200 innings for the third straight season.
He was ninth in the NL with a career-best and club-record 170 strikeouts and became one of only three pitchers in Rockies history to win 13 games in a season.
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