Mr Freeman's comments were in response to the death of 29-year-old Ms Mckee, who was shot dead during rioting.
I am asking people to do the right thing for Lyra McKee, for her family and for the city of Derry/Londonderry and help us stop this madness.
"It's left so many friends without their confidante, victims in the LGBTQIA society and community left without a tireless advocate and activist".
"This can not stand. Lyra's death must not be in vain because her life was a shining light in everyone else's life".
"We certainly believe there was more than one person who was involved in this last night. Her only crime was standing too close to a PSNI vehicle".
A local journalist at the scene of Thursday's shooting, Leona O'Neill, wrote on Twitter that after McKee was hit and fell beside a police Land Rover, officers rushed her to hospital, where she died.
Fernandinho reacts to Manchester City’s dramatic night in two words
City equalised through Bernardo Silva a minute later and were leading again after 21 minutes as Sterling scored his second. Perhaps Guardiola & Co. can take solace in knowing they will get another shot at Spurs on Saturday, in the Premier League.
British counterpart Theresa May said the killing was "shocking and truly senseless".
"The circumstances in which it happened, the firing on the police force that are seeking to protect the peace process, can not be condoned by anybody".
It claimed responsibility for a number of parcel bombs sent to London and Glasgow recently. But her shooting, during rioting in Derry, is of political as well as bad personal significance.
Speaking at a rally in Fanad Drive on Friday afternoon, Sara said she had "lost the love of her life".
Lyra McKee was an editor for the news site Mediagazer, and her work appeared in Buzzfeed and The Atlantic.
In 2016, Forbes Magazine named her one of their 30 under 30 in media and she had been working on a new book which was due to be published in 2020 at the time of her death.
Journalist Lyra McKee poses for a portrait outside the Sunflower Pub on Union Street in Belfast, Northern Ireland May 19, 2017. "There is nothing we could say that would not sound like a hollow apology", the group said.
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Scotland Yard has warned protesters the force had "strong plans" in place with a significant number of officers ready to respond. Extinction Rebellion organiser Robin Ellis-Cockroft boasted: "We said we'd disrupt Heathrow and we've disrupted Heathrow".
"A bright light has been quenched and that plunges all of us into darkness".
In the post, she described the shame she felt at 14 as she kept the "secret" of her sexual preference from her family and friends and the love she received when she was finally able to reveal it.
Irish President Michael D Higgins speaks to media after signing the book of condolence at Belfast City Hall in remembrance of murdered journalist Lyra McKee.
He asked: "Have you no sense of humanity or dignity about yourself?"
Images on social media showed a auto and van ablaze and hooded individuals throwing petrol bombs and fireworks at police vehicles.
"Regretfully, people such as I described earlier who are completely out of step, goaded and orchestrated young people to engage in disorder", he said.
Over 100 Car2Go vehicles stolen in Chicago
While members' personal information hasn't been compromised, it's pausing service out of precaution, Silverman said. Police spokesperson Christine Calace said 21 people were charged with misdemeanor criminal trespass to vehicles.