Society and Culture
Sarah Hewitt-Clarkson said the last 12 weeks of demonstrations had brought “distress and harassment” to staff, pupils and many parents.
Daniel Kelley admitted 11 hacking-related offences.
The 78-year-old had shown "no remorse" until the guilty plea, police said.
He took about £7,000.
The victim is believed to be originally from Lebanon.
The Labour MP said demonstrators arguing against LGBT lessons had a "just cause".
"There is NO Active Shooter at Dupont Circle. There are injuries from people running from what they thought were gunshots," tweeted the deputy mayor for public safety.
The aspiring musician was stabbed to death in Hackney in May.
It comes as four males aged 15 to 18 were held on Friday following the attack on May 30, Scotland Yard said.
In 2011 Sally Challen, 65, was jailed for the murder of her husband Richard, 61. Her sons, James and David, believe Sally was the victim of long-term psychological abuse, something they suggest was ignored during her initial trial. Her murder conviction was quashed by the Court of Appeal in February 2019. Prosecutors at the Old Bailey accepted a lesser manslaughter plea on the grounds of diminished responsibility. On 7 June 2019 it was announced that she will not face a retrial for Richard's murder.