Shackelford, who was optioned to Triple-A Louisville shortly after his arrest, issued a statement Tuesday afternoon through the Reds.
"Today I am grateful and relieved that this issue can finally be put behind me," Shackelford said. "I have said from the beginning that the claims made against me were absolutely false and I am pleased that the District Attorney's office in Milwaukee, after careful review, agrees that there is no merit to these allegations. I want to thank the District Attorney's office and my attorney for working so hard to resolve this case quickly.
"I want to apologize to the Cincinnati Reds organization for any negative publicity this may have caused. I hope that any damage to my reputation from this unfortunate incident will not be long lasting, and that I can continue to work hard to help the Cincinnati Reds long into the future."
A left-handed situational reliever, Shackelford was 1-0 with a 7.71 ERA in two big-league stints with the Reds this season. He is 1-0 with a 2.18 ERA in 22 games with Louisville.
For the fifth consecutive game, utility man Ryan Freel was out of the lineup on Tuesday as he battled with a sore right shoulder. Freel, who has been limited to pinch-hitting duty, was available again to come off the bench.
"He'll probably get a start tomorrow night, for sure by Thursday," Reds manager Jerry Narron said.
Freel came to the ballpark during the Reds' off-day on Monday to throw and work out.
"It's good," Freel said. "It seems like it's been a while, a long time [since I've started]. We're winning, and it's a lot easier to sit when you're winning."
Because of the injury, Freel has been unable to take advantage of the right-field opening created by last week's trade of Austin Kearns. Freel was expected to share time with rookie Chris Denorfia.
"Jerry mentioned it would open more doors as far as playing time," Freel said. "There's not a real labeled right fielder that plays every day. That's an opening for me to play. ... We'll see what happens. Hopefully, they don't forget I can play infield, too."
Claussen backed up:
Brandon Claussen's rehabilitation start on Monday for Triple-A Louisville was scratched after the left-hander came down with a sore back. Claussen, who is on the disabled list with rotator cuff tendinitis, said it suddenly hurt when he bent over to pick up a bag for his trip on Sunday.
"I woke up the next day and it was the worst it ever felt," Claussen said.
A tentative rescheduling of the start for Wednesday has also been wiped out. Claussen played catch on Tuesday. His next step is to throw in the bullpen.
"There's no definite time that's going to happen," head trainer Mark Mann said. "It's a matter of when his [back] symptoms stop."
More injury reports:
Right-hander Paul Wilson (shoulder), who threw six innings for Class A Sarasota on Friday in a resumption of his rehab assignment, is scheduled to start a game on Thursday for Louisville.
Wilson is expected to throw between 90-100 pitches in the game. In his previous outing, his fastball ranged between 84-87 mph, Mann's reports said.
Reliever Grant Balfour (elbow/shoulder) does not have a scheduled date to resume his rehab assignment. Balfour, battling a sore muscle in his arm after two games with Class A Dayton, will have to throw in the bullpen before he's cleared to pitch in a simulated game.
With the July 31 non-waivers trade deadline closing in, the trade rumor mill usually starts running at full speed. It can often distract some players, but Narron didn't believe it would be an issue with his club.
"It can be, in a lot of cases, but I doubt it's going to be here," Narron said. "We've already made a pretty big deal."
Coming off strong back-to-back starts, Aaron Harang will seek his 11th win when the Reds and Mets play Wednesday at 7:10 p.m. ET. Steve Trachsel is scheduled to pitch for New York.