Capitol police said his death was under investigation by homicide detectives from the Washington metropolitan police and federal law enforcement.
Capitol police have not released details about how Ms Boyland died.
As rioters overpowered Capitol police, Sicknick was pepper-sprayed and hit in the head, his father said. However, the official statement did not specify what caused the injuries that resulted in Sicknick's death.
The Capitol Police said in a statement that Sicknick was injured "while physically engaging with protesters".
There have been discussions at the White House about Trump leaving Washington on January 19, Reuters reported citing a source familiar with the matter. "Those who violently besieged our Capitol are the opposite of everything this administration stands for".
An officer who was injured after responding to riots at the US Capitol in Washington DC has died, US Capitol Police said.
But the departures do not answer painful questions about why Capitol security was so easily overwhelmed, why the Capitol Police failed to request sufficient reinforcements from the D.C. Police and the National Guard, and why some officers appeared to be appeasing the extremist interlopers - with at least one officer allowing a rioter to snap him in a selfie - lawmakers said. She said Sund promised her the police were ready. Numerous images were taken by the rioters themselves, few of whom wore masks that would have lowered not only their chances of contracting the coronavirus, but their chances of being identified.
The officer's death brings the fatalities from Wednesday's mayhem to five.
United Nations High Commissioner for Human Rights Michelle Bachelet on Thursday expressed serious concern about the attack on the US Capitol, which she said "demonstrated clearly the destructive impact of sustained, deliberate distortion of facts, and incitement to violence and hatred by political leaders".
There were also widespread calls to invoke the 25th Amendment to remove Trump from the office.
"Making fun of liberals together, we bonded over that a lot", he said.
When the rioters broke into the building, they took over over the House and Senate chambers as lawmakers were voting to affirm President-elect Joe Biden's victory.
House Speaker Nancy Pelosi issued this statement on Sicknick's death Friday, noting she ordered flags at the Capitol lowered to half-staff in his honor.
Rep. Peter Meijer, Michigan Republican, said, "It didn't have to be this way".
The 42-year-old U.S. Capitol police officer killed in Wednesday's riots is a military veteran from New Jersey.
"Brian is a hero and that is what we would like people to remember", the family said. He also created a social media website with the same name to connect Trump supporters, according to WNEP TV in Moosic, Pennsylvania.
"None of this should have happened", Mr Sasse said in a statement.
"The past four years we have had a president who has made his contempt for our democracy, our Constitution, the rule of law, clear in everything he has done", he said.
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