Polce reported no arrests or incidents Monday.
The father, mother and grandmother of Anthony Lamar Smith, who was shot to death by a St. Louis police officer in 2011, marched with demonstrators Sunday, as protests continued following the acquittal of the officer, Jason Stockley.
Stockley shot the 24-year-old Smith after a police chase over a suspected drug deal.
Shortly after a judge acquitted Stockley on Friday, demonstrators gathered outside the courthouse, where they were met with police in riot gear.
Stockley, who was not charged initially, pleaded not guilty and waived his right to a jury trial, leaving the ruling up to the judge.
Prosecutors argued that a revolver found in Smith's car had been planted by Stockley.
In his ruling, St. Louis Circuit Judge Timothy Wilson said the prosecution's argument was "not supported by the evidence."
Stockley left the department in August 2013. A wrongful death suit filed by Smith's family was settled by the St. Louis police board for $900,000.
Police Chief Lawrence O'Toole and St. Louis Mayor Mayor Lyda Krewson said the vast majority of Friday's protests were peaceful, but trouble started after nightfall.
Some protesters smashed the windshield of a police vehicle and threw water bottles, rocks and bricks at law enforcement.
At least 33 people were arrested, and 11 law enforcement officers were injured in Friday night's protests.
On Saturday, protesters marched through the West County Center Mall in Des Peres, outside St. Louis, chanting "No justice, no profits."
CNN affiliate KMOV said the mall protest lasted about an hour.
Protesters chanted "Black lives matter" as shoppers looked on.
Police said the mall protest was peaceful, but at West County Center, employees at some stores, including Macy's, shut the doors as demonstrators marched.
Police guarded an entrance to the West County Center Mall after demonstrators marched through.
Saturday night's demonstrations started with a few hundred people marching peacefully in streets near downtown.
Demonstrators march through University City, a suburb close to downtown St. Louis.
Demonstrators confronted police and called for some city leaders to step down.
Dozens of business windows were smashed and at least two police cars were damaged Saturday night.
Mayor Krewson told CNN she blamed the vandalism on agitators who remained after peaceful daytime protests ended.
Sunday's demonstrations began peacefully.
But the demonstrations turned violent, and authorities said more than 120 people were arrested Sunday as protesters attacked police, broke windows and flipped over trash cans.
The protests continued Monday, with demontrators gathering on Market Street, a few blocks from the site of the previous night's violence.
University City Police Officers stand outside a local business Monday evening in anticipation of another night or protests.
Carpenters secure wooden boards to a St. Louis tattoo parlor. "The days have been calm, but the nights have been destructive," said Mayor Krewson.
On Monday night, demonstrators gathered outside of the St. Louis Justice Center to protest the arrests of more than 123 during Sunday's protests.